Support multi source source provenance info #2098
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Fixes #2073
This PR provides a way for multi-source plugins to provide source provenance info in their own way instead of only the top level source source info being used.
This is done by exposing the optional
source_provenance_attrsargument tocreate_source_info()which when used overrides the usage of the default provenance for a source. Any plugin that needs to parse provenance in it's own way can then supply it's results using this. This has been trialled with thecargo2source plugin in https://gitlab.com/BuildStream/buildstream-plugins-community/-/merge_requests/408.