Add support for proposed 3.17 APIs

[baronfel]

3.17 adds APIs for the following features:

• [ ] Specify how clients will handle stale requests.
• [ ] Add support for a completion item label details.
• [ ] Add support for workspace symbol resolve request.
• [ ] Add support for label details and insert text mode on completion items.
• [ ] Add support for shared values on CompletionItemList.
• [ ] Add support for HTML tags in Markdown.
• [ ] Add support for collapsed text in folding.
• [ ] Add support for trigger kinds on code action requests.
• [ ] Add the following support to semantic tokens:
• [ ] server cancelable
• [ ] augmentation of syntax tokens
• [ ] Add support to negotiate the position encoding.
• [ ] Add support for HTML tags in markdown.
• [ ] Add support for relative patterns in file watchers.
• [ ] Add support for type hierarchies
• [ ] Add support for inline values.
• [x] Add support for inlay hints.
• [ ] Add support for notebook documents.
• [ ] Add support for diagnostic pull model.

We should add our side to match.

[TheAngryByrd]

https://github.com/ionide/LanguageServerProtocol/pull/52 covers a lot of these.