Stream zip archive when fetching non-range-request metadata #1792
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Summary
If a registry doesn't support range requests, then today, we download the entire wheel to disk and then read the metadata from the downloaded archive. This PR instead modifies the registry client to stream the zipfile and stop as soon as it's seen the metadata, which should be more efficient.
Closes #1596.
Test Plan
Made this the only path for downloading metadata; verified that the test suite passed.