chore: Transition to src/ layout

[effigies]

This PR moves bids into src/bids and the majority of the data in bids/tests/data into tests/data. This ensures the data is present in sdists so that full tests can be run, while omitted from wheels and installed modules.

Probably easiest to review commit-by-commit. The first commit is nothing but the move, so it's easiest to ignore that.

Closes #1090.

[codecov]

Codecov Report

Attention: Patch coverage is 94.63087% with 8 lines in your changes missing coverage. Please review.

Project coverage is 89.67%. Comparing base (88c32ef) to head (1e6449e).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/bids/layout/tests/conftest.py	91.42%	6 Missing ⚠️
src/bids/conftest.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1099      +/-   ##
==========================================
- Coverage   89.78%   89.67%   -0.11%     
==========================================
  Files          64       65       +1     
  Lines        7154     7119      -35     
  Branches      835      836       +1     
==========================================
- Hits         6423     6384      -39     
- Misses        534      537       +3     
- Partials      197      198       +1     

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[effigies]

A review would be appreciated if someone has the time, but I'm comfortable with our test coverage and the scope of these changes to merge without review.

Will merge tomorrow unless stopped.

[effigies]

Ah, it's not a UT holiday. @adelavega any interest in a quick look?

[adelavega]

Just from looking at the commits everything looks fine to me.

Did you try installing it locally just to do a sanity check? Otherwise LGTM.

[effigies]

Yeah, basic stuff works, and we've got like >90% test coverage so I think we're pretty safe.

[bpinsard]

great! thanks!