Always Show Return Type / Signature For All Items In Suggest Widget

Always show return types.

This is in Dart, and is very useful.

For example, in Dart:

| OPTIONS |
|:-:|
| 1: _Full signature, split between left/right_

|
| 2: _Full signature on left_

|
| 3: _Full signature on right_

|
| 4: _Abbreviated params (...), split between left/right_

|
| 5: _Abbreviated params (...) on left_

|
| 6: _Abbreviated params (...) on right_

|

Here is the original issue in Dart:
- https://github.com/Dart-Code/Dart-Code/issues/2462#issuecomment-1561650978

Personally, I like option 5, but would also like if there was a setting to use option 2 instead.