[New Feature]: Support snippets in code action text edits

[IMS94]

Description

With microsoft/language-server-protocol#592 LSP 3.18 will add support for snippets in code action text edits.

Seems like VSCode already supports that microsoft/vscode#145374. If so, we should be able to use snippet text edits without the new LSP version.

This will be a major improvement since writing/editing names, etc in text edits applied by code actions will be easier with this.

Describe your problem(s)

Right now, we can't have placeholders inside text edits returned by code actions

Describe your solution(s)

Use Snippet text edits coming in 3.18 of LSP

Related area

-> Editor