feat(datasource/crate): fetch crate metadata from crates.io #15214
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Changes
This PR adds changelogs to Rust crate update PRs by downloading crate metadata from crates.io. It is using a fast path on the crates.io server to avoid unnecessary database requests (see code comment) and work around the regular request per second limitation. Since the metadata rarely changes, it will be cached for 24 hours to avoid unnecessary API requests.
Example PR from this branch: Turbo87/renovate-crates-test#3
Context
Closes #3486
Note that I have seen #14841, but since the discussion there was not concluded yet, I've implemented it only for the crates.io datasource for now.
Documentation (please check one with an [x])
How I've tested my work (please tick one)
I have verified these changes via: