sources/cargo.py: Adding new cargo source

As requested here in this merge request

This new Source requires BuildStream >= 1.3.1, and can be used to automate fetching the 'crate' dependencies of elements which use rust and cargo.

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@tristanvb CI seems to have failed

mentioned in issue #37 (closed)

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mentioned in merge request freedesktop-sdk/freedesktop-sdk!1588 (closed)

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merged

mentioned in commit d708abae