[Duplicate] Allow repo rules to download multiple things in parallel. #20857
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This is accomplished by adding a "block" argument to the "download" call. If set,
the call returns a "pending download" object with one single method that waits for the download to finish.
Appropriate care is taken that downloads don't hang around after the repository function finishes running.
Fixes #19674 .
RELNOTES: None.
Commit 73c1a1e
PiperOrigin-RevId: 588320352
Change-Id: Ib0f48b6c7c2a07e93a4af602b0045120bd418829