Deprecate monitor.py

[rly]

Motivation

monitor.py is not used and was ported over from the beginning of HDMF. It looks to contain an abstract utility class for monitoring the progress of processing DataChunkIterator objects, and it contains an example of such a class. Neither is used or documented. To improve maintainability of HDMF, I propose we deprecate the module and remove it in HDMF 5.0.

Related: #766

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

All modified and coverable lines are covered by tests ✅

Project coverage is 91.07%. Comparing base (b8a1a26) to head (d79e113).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1245      +/-   ##
==========================================
+ Coverage   90.87%   91.07%   +0.20%     
==========================================
  Files          42       42              
  Lines        9537     9539       +2     
  Branches     1926     1926              
==========================================
+ Hits         8667     8688      +21     
+ Misses        576      557      -19     
  Partials      294      294              

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