Refactor dynamic table

[ehennestad]

Motivation

PR #543 (Convert Azure Pipelines to GitHub actions) contained several changes to the dynamic table interface. In order to keep a clear separation of concerns, I wanted to separate all code changes related to dynamic table refactoring into a separate (this) PR.

Checklist

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

[ehennestad]

@lawrence-mbf Would you mind giving a brief overview of the motivation for the changes in this PR?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.83333% with 34 lines in your changes missing coverage. Please review.

Project coverage is 90.18%. Comparing base (6717aa1) to head (07b746d). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
+types/+util/+dynamictable/addVarargColumn.m	73.17%	22 Missing :warning:
+types/+util/getVectorClassName.m	60.86%	9 Missing :warning:
+types/+util/+dynamictable/addColumn.m	94.44%	1 Missing :warning:
+types/+util/+dynamictable/addRawData.m	92.30%	1 Missing :warning:
+types/+util/+dynamictable/getIndex.m	97.56%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #612 +/- ## ========================================== - Coverage 90.63% 90.18% -0.46% ========================================== Files 106 107 +1 Lines 4689 4767 +78 ========================================== + Hits 4250 4299 +49 - Misses 439 468 +29 ```

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