[vscode] some signature changes from [] to Array<>

[rschnekenbu]

CodeActionProvider#provideCodeActions() signature has changed from (Command | T)[] to Array<Command | T>
Same for one of the ShellExecution constructors.

This will also covers changes to AI and LLM support

• LanguageModelChatMessage constructor & content from XX[] to Array + static utilities
• LanguageModelToolResultPart content from XX[] to Array
• LanguageModelToolResult content from XX[] to Array
• PreparedToolInvocation invocationMessage now supports also MarkdownString

[new edit] This can also cover evolution on proposed API mappedEditProviders, to avoid too many small PRs.