[diag] Add new command to factory diags radoi command.

Commit adds new command to factory diag called `radio`.
	- `enable` for enabling the interface to dfault mode,
	- `disable` for disabling the interface

src/core/diags/README.md

@@ -226,6 +226,24 @@ Return the state of the radio.
 sleep
 ```
 
+### diag radio enable
+
+Enable radio interface and put it in receive mode.
+
+```bash
+> diag radio enable
+Done
+```
+
+### diag radio disable
+
+Disable radio interface.
+
+```bash
+> diag radio disable
+Done
+```
+
 ### diag rawpowersetting
 
 Show the raw power setting for diagnostics module.

src/core/diags/factory_diags.cpp

@@ -621,6 +621,14 @@ Error Diags::ProcessRadio(uint8_t aArgsLength, char *aArgs[])
             break;
         }
     }
+    else if (StringMatch(aArgs[0], "enable"))
+    {
+        SuccessOrExit(error = Get<Radio>().Enable());
+    }
+    else if (StringMatch(aArgs[0], "disable"))
+    {
+        SuccessOrExit(error = Get<Radio>().Disable());
+    }
 
 exit:
     AppendErrorResult(error);