perf(lsp): cache completion item resolution during request #27831
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bartlomieju
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This commit adds a simple HashMap cache to completion requests.
On a test project the time to compute completions went from 1200ms
to 75ms and the cache contained ~300 entries when 8000 completion
items were produced by the TSC.
This is a short-lived cache and is discarded once the completion
request is finished. In a follow up commits we could make it persist
between requests.