Add/aligned dynamic table

[oruebel]

Motivation

Add support for new AlignedDynamicTable type originally developed as part of ndx-icephys-meta to hdmf.common

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.

[oruebel]

@rly @ajtritt this PR is ready for review

[oruebel]

@ajtritt can you re-approve. There was a merge conflict on the CHANGELOG that blocked merging

[codecov]

Codecov Report

Merging #551 (09ce741) into dev (4e32a9f) will increase coverage by 0.22%.
The diff coverage is 98.42%.

@@            Coverage Diff             @@
##              dev     #551      +/-   ##
==========================================
+ Coverage   85.22%   85.45%   +0.22%     
==========================================
  Files          39       41       +2     
  Lines        8082     8209     +127     
  Branches     1728     1764      +36     
==========================================
+ Hits         6888     7015     +127     
+ Misses        842      841       -1     
- Partials      352      353       +1     

Impacted Files	Coverage Δ
src/hdmf/common/table.py	83.53% <ø> (ø)
src/hdmf/common/alignedtable.py	98.27% <98.27%> (ø)
src/hdmf/common/__init__.py	74.16% <100.00%> (+0.43%)	⬆️
src/hdmf/common/io/__init__.py	100.00% <100.00%> (ø)
src/hdmf/common/io/alignedtable.py	100.00% <100.00%> (ø)
src/hdmf/build/objectmapper.py	91.87% <0.00%> (+0.24%)	⬆️

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