[SPARK-40500][PS] Deprecate iteritems in DataFrame and Seriese

### What changes were proposed in this pull request?

1. Use `pd.items` instead of `pd.iteritems`
2. Deprecate `ps.iteritems`

### Why are the changes needed?
`pd.iteritems` is deprecated in 1.5

before:
```
In [4]: import pyspark.pandas as ps

In [5]: ps.Series([3, 4, 1, 1, 5])
/Users/ruifeng.zheng/Dev/spark/python/pyspark/pandas/internal.py:1573: FutureWarning: iteritems is deprecated and will be removed in a future version. Use .items instead.
  fields = [
/Users/ruifeng.zheng/Dev/spark/python/pyspark/sql/pandas/conversion.py:486: FutureWarning: iteritems is deprecated and will be removed in a future version. Use .items instead.
  for column, series in pdf.iteritems():

0    3
1    4
2    1
3    1
4    5
dtype: int64
```

after:
```
In [1]: import pyspark.pandas as ps

In [2]: ps.Series([3, 4, 1, 1, 5])

0    3
1    4
2    1
3    1
4    5
dtype: int64
```

### Does this PR introduce _any_ user-facing change?
Eliminate `iteritems` warnings

### How was this patch tested?
existing UT

Closes #37947 from zhengruifeng/ps_iteritems_to_items.

Lead-authored-by: Ruifeng Zheng <ruifengz@apache.org>
Co-authored-by: Hyukjin Kwon <gurwls223@gmail.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

python/pyspark/pandas/frame.py

@@ -1850,7 +1850,7 @@ def corrwith(
         sser.name = None
         return sser
 
-    def iteritems(self) -> Iterator[Tuple[Name, "Series"]]:
+    def items(self) -> Iterator[Tuple[Name, "Series"]]:
         """
         Iterator over (column name, Series) pairs.
 
@@ -2054,9 +2054,16 @@ def extract_kv_from_spark_row(row: Row) -> Tuple[Name, Any]:
             ):
                 yield tuple(([k] if index else []) + list(v))
 
-    def items(self) -> Iterator[Tuple[Name, "Series"]]:
-        """This is an alias of ``iteritems``."""
-        return self.iteritems()
+    def iteritems(self) -> Iterator[Tuple[Name, "Series"]]:
+        """
+        This is an alias of ``items``.
+
+        .. deprecated:: 3.4.0
+            iteritems is deprecated and will be removed in a future version.
+            Use .items instead.
+        """
+        warnings.warn("Deprecated in 3.4.0, Use DataFrame.items instead.", FutureWarning)
+        return self.items()
 
     def to_clipboard(self, excel: bool = True, sep: Optional[str] = None, **kwargs: Any) -> None:
         """

python/pyspark/pandas/internal.py

@@ -1579,7 +1579,7 @@ def prepare_pandas_frame(
                     nullable=bool(col.isnull().any()),
                 ),
             )
-            for (name, col), dtype in zip(reset_index.iteritems(), index_dtypes + data_dtypes)
+            for (name, col), dtype in zip(reset_index.items(), index_dtypes + data_dtypes)
         ]
 
         return (

python/pyspark/pandas/namespace.py

@@ -1191,7 +1191,7 @@ def output_func(pdf: pd.DataFrame) -> pd.DataFrame:
                 )
 
                 reset_index = pdf.reset_index()
-                for name, col in reset_index.iteritems():
+                for name, col in reset_index.items():
                     dt = col.dtype
                     if is_datetime64_dtype(dt) or is_datetime64tz_dtype(dt):
                         continue

python/pyspark/pandas/series.py

@@ -5951,7 +5951,7 @@ def item(self) -> Scalar:
         """
         return self.head(2)._to_internal_pandas().item()
 
-    def iteritems(self) -> Iterable[Tuple[Name, Any]]:
+    def items(self) -> Iterable[Tuple[Name, Any]]:
         """
         Lazily iterate over (index, value) tuples.
 
@@ -5998,9 +5998,16 @@ def extract_kv_from_spark_row(row: Row) -> Tuple[Name, Any]:
         ):
             yield k, v
 
-    def items(self) -> Iterable[Tuple[Name, Any]]:
-        """This is an alias of ``iteritems``."""
-        return self.iteritems()
+    def iteritems(self) -> Iterable[Tuple[Name, Any]]:
+        """
+        This is an alias of ``items``.
+
+        .. deprecated:: 3.4.0
+            iteritems is deprecated and will be removed in a future version.
+            Use .items instead.
+        """
+        warnings.warn("Deprecated in 3.4, Use Series.items instead.", FutureWarning)
+        return self.items()
 
     def droplevel(self, level: Union[int, Name, List[Union[int, Name]]]) -> "Series":
         """

python/pyspark/sql/pandas/conversion.py

@@ -471,7 +471,7 @@ def _convert_from_pandas(
                             pdf[field.name] = s
             else:
                 should_localize = not is_timestamp_ntz_preferred()
-                for column, series in pdf.iteritems():
+                for column, series in pdf.items():
                     s = series
                     if should_localize and is_datetime64tz_dtype(s.dtype) and s.dt.tz is not None:
                         s = _check_series_convert_timestamps_tz_local(series, timezone)
@@ -483,7 +483,7 @@ def _convert_from_pandas(
                             copied = True
                         pdf[column] = s
 
-            for column, series in pdf.iteritems():
+            for column, series in pdf.items():
                 if is_timedelta64_dtype(series):
                     if not copied:
                         pdf = pdf.copy()
@@ -601,7 +601,7 @@ def _create_from_pandas_with_arrow(
 
         # Create list of Arrow (columns, type) for serializer dump_stream
         arrow_data = [
-            [(c, t) for (_, c), t in zip(pdf_slice.iteritems(), arrow_types)]
+            [(c, t) for (_, c), t in zip(pdf_slice.items(), arrow_types)]
             for pdf_slice in pdf_slices
         ]
 

python/pyspark/sql/tests/test_pandas_grouped_map.py

@@ -708,7 +708,7 @@ def f(key, pdf):
             window_range = key[1]
 
             # Make sure the key with group and window values are correct
-            for _, i in pdf.id.iteritems():
+            for _, i in pdf.id.items():
                 assert expected_key[i][0] == group, "{} != {}".format(expected_key[i][0], group)
                 assert expected_key[i][1] == window_range, "{} != {}".format(
                     expected_key[i][1], window_range