[SCHEMA] Tabular metadata rules for both top and second-level tabular files

[TheChymera]

• Representation of second-level files added.
• Homogenization of modality and non-modality file representation.
• Documenting file identifiers such as README and _sessions as
  suffixes..

Co-authored-by: Taylor Salo tsalo006@fiu.edu

---

As per #987 (comment)

@tsalo @yarikoptic

[TheChymera]

Test failure seems to be some website which isn't available and was not introduced by this PR. Might even be temporary, but apparently I don't have permission to re-run the tests.

[yarikoptic]

linkchecker fail is mitigated/merged. I am really not sure on the motivation behind "Documenting file identifiers such as README and _sessions as suffixes..", in particular for those files like CHANGES. Could you provide more detail here or point to specific discussions which lead to that?

[TheChymera]

@tsalo @yarikoptic

I have incorporated the amendments from last week's meeting which reduced the scope of “suffixification”. This seems like a fairly simple self-contained addition of files previously not covered by the YAML which closes #978 .

So maybe we could discuss whether this can just be pulled today?

One small addition which I'd like to mention is that now we have temporarily given up on homogenizing the naming specification for all files.
Thus we have just created a representation for 2 new files which behave analogously to rules/datatypes/*.yaml without changing the representations of other non-modality files.
Perhaps it would be better, after all, to put the new tabular_metadata.yaml file in rules/datatypes/tabular_metadata.yaml, as previously suggested?
This would also make parsing of the schema into regex or placeholder example paths easier and compatible with current functions.

[effigies]

FWIW I approve of moving participants and samples into this group, but also okay with postponing it.

[tsalo]

LGTM. Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.13%. Comparing base (a4b4584) to head (a4b4584).
Report is 1473 commits behind head on master.

Additional details and impacted files

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  Coverage   35.13%   35.13%           
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  Files           8        8           
  Lines         834      834           
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  Hits          293      293           
  Misses        541      541           

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