Add DynamicTable non-generated base class

[ehennestad]

⚠️ Depends on #837 — merge that first

Motivation

DynamicTable methods (addRow, addColumn, getRow, toTable, clear) were previously injected into generated class files as thin delegators to utility functions in +types/+util/+dynamictable/. Because the generator writes methods as multiline strings, adding docstrings or arguments blocks there is impractical — so none existed.

The consequence was poor discoverability: no in-editor help text, no autocomplete hints for name-value arguments, and no input validation at the method boundary. Users had to trace through to the underlying utility functions to understand how to call the methods.

This PR introduces matnwb.neurodata.DynamicTableBase, a handwritten abstract base class that DynamicTable and its subclasses inherit from. The delegation to utility functions is unchanged — the only additions are docstrings and arguments blocks on each method, making them self-documenting and IDE-friendly.

The toTable method also renames the positional argument from index to keepRegionsIndexed for clarity.

How to test the behavior?

t = types.hdmf_common.DynamicTable( ...
    'description', 'test table', ...
    'colnames', {'x'}, ...
    'x', types.hdmf_common.VectorData('description', 'x col', 'data', [1; 2; 3]), ...
    'id', types.hdmf_common.ElementIdentifiers('data', int64([0; 1; 2])) ...
);

t.addRow('x', 4);
t.addColumn('y', types.hdmf_common.VectorData('description', 'y col', 'data', [10; 20; 30; 40]));
disp(t.getRow(1:2));
disp(t.toTable());
t.clear();

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

❌ Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (codex/aligned-dynamic-table-add-category@19a73bd). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
+matnwb/+neurodata/DynamicTableBase.m	94.28%	2 Missing ⚠️

Additional details and impacted files

@@                             Coverage Diff                             @@
##             codex/aligned-dynamic-table-add-category     #838   +/-   ##
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