Test workspace edit API improvements

[jrieken]

Refs: #148667, #145374

• anyOS @aeschli
• anyOS @joyceerhl

Complexity: 4

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We made improvements to the WorkspaceEdit-API. It now allows to create files with content (binary or text) and now allows to make snippet text edits. The latter requires an editor but falls back to a normal text edits. To test, do the following

• Create an extension (guide)
• Use latest stable API npx vscode-dts main
• use the vscode.workspace.applyEdit-API
• test that WorkspaceEdit#createFile allows to pass content and that the file will be created with that content
• test that there is SnippetTextEdit which can used with the WorkspaceEdit#set-method.
• test that both APIs work and that both are properly documented
• for the snippet text edit:
  • when no editor is open/active the edit will be applied without snippet behaviour - just the default text is inserted
  • only snippet edits for the active editor are putting the editor into snippet mode, others are inserted as text
  • you can mix snippet edits and normal edits as you like