Add and test support for bitset default annotation

[jwillemsen]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 59.90%. Comparing base (6b8e775) to head (7fe9b8c).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/idl4/default/client.cpp	28.57%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
- Coverage   59.90%   59.90%   -0.01%     
==========================================
  Files         605      605              
  Lines       48560    48567       +7     
  Branches     4294     4296       +2     
==========================================
+ Hits        29091    29093       +2     
  Misses      16281    16281              
- Partials     3188     3193       +5     

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