feat: Add Format selected text option

[RomeoDev777]

Is there an existing request for this?

• I have searched the existing issues

I have tried the Pre-Release of the extension.

• Feature is not present in the latest Pre-Release

Feature Request

The only option for formatting is "Format Document".
Can we add "Format selected"?

[gnikit]

I'm not sure if this is possible with all formatters since they are not meant to receive text selections but rather complete files that are written on the disk.

[manvendra5345]

Hello! I’m interested in contributing to this project as part of GSoC.
Could you please assign this issue to me? I’d love to work on it and get started.
Thanks!