Point on object constraint

[matscalia]

Add the last constraint discussed in #1979.

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.98%. Comparing base (32c4d62) to head (f1ba715).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cadquery/occ_impl/sketch_solver.py	90.47%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1985      +/-   ##
==========================================
+ Coverage   95.96%   95.98%   +0.01%     
==========================================
  Files          29       29              
  Lines        7857     7911      +54     
  Branches     1174     1191      +17     
==========================================
+ Hits         7540     7593      +53     
+ Misses        183      182       -1     
- Partials      134      136       +2     

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