Delete src/hdmf/build/map.py

[rly]

Motivation

Removing this is part of the HDMF 4.0 deprecations.

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 90.86%. Comparing base (8194a8a) to head (fa084a5).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1221      +/-   ##
==========================================
+ Coverage   90.82%   90.86%   +0.03%     
==========================================
  Files          43       42       -1     
  Lines        9524     9520       -4     
  Branches     2723     2723              
==========================================
  Hits         8650     8650              
+ Misses        580      576       -4     
  Partials      294      294              

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