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Send Content-Length for raw API archives

Administrator requested to merge raw-api-content-length into master

Created by: felixfbecker

Fixes #1554

This allows browsers and language servers to show a progress bar while downloading.

According to the docs, cachedFetch(), which is called by GitServerFetchArchive(), always serves from the cache. If the cache item is missing, it will fill the cache first, then return a file handle to it. We can stat that file handle and return its size as Content-Length.

cachedFetch will open a file from the local cache with key. If missing, fetcher will fill the cache first. cachedFetch also performs single-flighting.

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