feat: request cancellation #7054
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This PR adds language server support for request cancellation to the following expensive requests: Code actions, auto-completion, document symbols, folding ranges and semantic highlighting. This means that when the client informs the language server that a request is stale (e.g. because it belongs to a previous state of the document), the language server will now prematurely cancel the computation of the response in order to reduce the CPU load for requests that will be discarded by the client anyways.