Improve signature of get_field is function

[alamb]

Is your feature request related to a problem or challenge?

The signature of get_field is akward -- it requires a string but the function signature takes a "Expr" so you have to wrap it with lit

you would have to write

get_field(col("a"), lit("value")

Previously you could write

col("a").field("value")

but after #10565 that panics

Describe the solution you'd like

I would like to have get_field take a str instead:

get_field(col("a"), "value")

Probably with a signature like

fn get_field(expr, field_name: impl Into<Literal>) -> Expr {
  let field_name_as_expr = lit(field_name.into());
  ..
}

Describe alternatives you've considered

leave it as is

Additional context

No response