Zarr append for datasets (non-reference)

[mavaylon1]

Motivation

What was the reasoning behind this change? Please explain the changes briefly.

This supports appending to zarr arrays. This does not cover the edge case for dataset of references. This has the base tests for append_data. There are more tests (TBD) in hdmf-zarr that incorporate the full IO process.

How to test the behavior?

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

Checklist

• [x] Did you update CHANGELOG.md with your changes?
• [x] Does the PR clearly describe the problem and the solution?
• [x] Have you reviewed our Contributing Guide?
• [x] Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.56%. Comparing base (7426275) to head (57a0981).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1136 +/- ## ========================================== - Coverage 88.79% 85.56% -3.23% ========================================== Files 45 45 Lines 9774 9778 +4 Branches 2776 2777 +1 ========================================== - Hits 8679 8367 -312 - Misses 778 1075 +297 - Partials 317 336 +19 ```

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