feat: allow specifying components by Component commit footer

[axieum]

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Closes #1905 🦕

[rozsazoltan]

@axieum This modification will be completed? I find it a very useful idea.

[axieum]

@axieum This modification will be completed? I find it a very useful idea.

Please see the comment #1905 (comment) on the original issue. We need to find the best way to approach parsing the commit footers before writing the implementation.

But alas, the failing tests are here and ready for whenever it wants to be picked up again.