Support lsp_client.cancel_requests()

[SuperBo]

While developing neovim plugin for LSP-AI, I found that despite of asking LSP to cancel previous request, I still received multiple responses from server.

[SilasMarvin]

Great issue to flag. This is something we need to add support for. For right now, I would just ignore them, but I will get this on the roadmap.

Thanks for making an issue for it!