Save schema SHA

[ajtritt]

Motivation

Store SHA of schema in files.

How to test the behavior?

Show how to reproduce the new behavior (can be a bug fix or a new feature)

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

Merging #546 (089b22b) into dev (de33763) will decrease coverage by 1.84%.
The diff coverage is n/a.

❗ Current head 089b22b differs from pull request most recent head 7abe402. Consider uploading reports for the commit 7abe402 to get more accurate results

@@            Coverage Diff             @@
##              dev     #546      +/-   ##
==========================================
- Coverage   86.59%   84.74%   -1.85%     
==========================================
  Files          42       39       -3     
  Lines        8659     7900     -759     
  Branches     1868     1670     -198     
==========================================
- Hits         7498     6695     -803     
- Misses        832      876      +44     
  Partials      329      329              

Impacted Files	Coverage Δ
src/hdmf/common/io/table.py	60.00% <0.00%> (-23.51%)	⬇️
src/hdmf/spec/spec.py	78.01% <0.00%> (-6.85%)	⬇️
src/hdmf/common/__init__.py	71.02% <0.00%> (-4.81%)	⬇️
src/hdmf/spec/namespace.py	83.81% <0.00%> (-3.76%)	⬇️
src/hdmf/validate/validator.py	80.47% <0.00%> (-3.48%)	⬇️
src/hdmf/data_utils.py	88.92% <0.00%> (-2.39%)	⬇️
src/hdmf/validate/errors.py	84.31% <0.00%> (-2.30%)	⬇️
src/hdmf/spec/catalog.py	92.66% <0.00%> (-1.89%)	⬇️
src/hdmf/build/manager.py	80.88% <0.00%> (-1.68%)	⬇️
src/hdmf/backends/hdf5/h5tools.py	81.42% <0.00%> (-0.66%)	⬇️
... and 13 more

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