TextEditor.edit snippet overload now returns void. No longer preventing when already in snippet mode.

doc - mention that status bar messages must be disposed, move signature down to encourage auto-dispose cases

* Add Go To Implementation Api

For #10806

Adds a new API for supporting  `go to implementation` command for languages. Implements an example for TS

* Rename

* Cleanup

Fixes #15583

More robust type validation on ext side of insertSnippet.
Position/range check for snippet insertion was inverted.
Adding insertSnippet to vscode.d.ts. (Should it be in vscode.proposed.d.ts?)
Adding extension API tests for insertSnippet.

* Add CompletionItemKind.Folder

Fixes #17435

Adds a new completion item kind for folder/directories. This is useful for path intellisense

For the icons, I copied the icons for folders into the suggestion icon set. Let me know if new ones are needed instead.

* Fix monaco.d.ts

Fixes #17356

 In description for ExtensionContext -> storagePath, links to globalState and workspaceState are incorrect and lead to an error page.

This reverts commit 492fda67.

update jsdoc, #13924