feat(commands): add insertFinalNewLine

[SunsetTechuila]

resolves #241075

PR Overview

This pull request introduces a new command that automatically inserts a final new line into the text model if one isn’t present. Key changes include:

• Implementation of the InsertFinalNewLineCommand, which computes and applies the edit operation for inserting the final new line.
• Addition of the InsertFinalNewLineAction that integrates the command into the editor action framework.
• Registration of the new command in the global editor module through an updated import in editor.all.ts.

Changes

File	Description
src/vs/editor/contrib/insertFinalNewLine/browser/insertFinalNewLineCommand.ts	Contains the logic to insert a final new line if required.
src/vs/editor/contrib/insertFinalNewLine/browser/insertFinalNewLine.ts	Defines the editor action that triggers the final new line insertion command.
src/vs/editor/editor.all.ts	Registers the new final new line command with the editor.

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