gh-38088: Add `# sage_setup: distribution` directives for the files of existing distributions sagemath-{categories,...,tdlib}
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These directives at the top of the file inform developers about the
assignment of modules to pip-installable distributions.
As of this PR, there should be no change to the existing distributions
(sagemath-categories...) nor the monolithic build of the Sage library.
This is a portion of:
- #37901
In contrast to that PR, it has no dependencies.
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preview.
### :hourglass: Dependencies
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URL: https://github.com/sagemath/sage/pull/38088
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee
