Validate that int data is used for ElementIdentifiers on init, append, extend

[rly]

Motivation

Fix #1001

Added hooks for validating Data objects when data is being set to a new array, a new element is being added to data, and when data is being extended with an iterable.

This will be useful when #868 is finished.

This does NOT check when Data.data is set to a mutable object like a list and that list object is modified, e.g.,

e = ElementIdentifiers(name="ids", data=[1, 2, 3])
e.data.append("test")  # will work
e.append("test")  # will raise error now

I do not think it is possible to stop the above operation.

How to test the behavior?

pytest

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Project coverage is 88.57%. Comparing base (af13e72) to head (a4a593e).
Report is 88 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/hdmf/data_utils.py	0.00%	1 Missing and 1 partial ⚠️
src/hdmf/utils.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1009   +/-   ##
=======================================
  Coverage   88.57%   88.57%           
=======================================
  Files          45       45           
  Lines        9484     9503   +19     
  Branches     2697     2702    +5     
=======================================
+ Hits         8400     8417   +17     
- Misses        763      764    +1     
- Partials      321      322    +1     

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