fix(macros): cache macro metadata based on CARGO_MANIFEST_DIR
#3815
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Does your PR solve an issue?
fixes #3738
Is this a breaking change?
no.
This PR updates the metadata cache to be a
HashMapthat stores aMetadatawithCARGO_MANIFEST_DIRas the key as mentioned in #3738 (comment).The lock on the metadata can be release earlier but that would require some more code changes. (For example the lifetime on
QueryDataSourcehas to be removed.)