[I] Add a `mirror-info` format string [buildstream]

["joshua-zivkovic (via GitHub)" <gi...@apache.org>]

joshua-zivkovic opened a new issue, #2213:
URL: https://github.com/apache/buildstream/issues/2213

   Adding a new `mirror-info` format string was recently [raised on the mailing list](https://lists.apache.org/thread.html/tg1zn20n523yfkdkhbzozg0tnscov32t) and in the Matrix channel.
   
   The addition of this new format string would provide users with information about mirrors beyond what `source-info` currently provides (just an unaliased upstream URL) and would allow tooling like [BuildStream-SBOM](https://gitlab.com/BuildStream/buildstream-sbom), which wraps `bst show`, to have functionality related directly to mirrors.
   
   The output should include at least:
   - the unalised URL
   - the aliased URL
   - any mirror URLs
   
   This can be used in exactly the same way `source-info`, nothing special is required, it just provides different information through `bst show`.


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