feat(autocad): adds surface and region converters

[clairekuang]

• adds support for sending surfaces and regions as meshes
• adds brep to mesh raw converter
• refactors existing solid and body converters to use new brep converter to avoid duplicate logic

before:
https://latest.speckle.systems/projects/25d1713b7f/models/87d7a331a8@031076f7e9#threadId=0912fbdc42

after:
https://latest.speckle.systems/projects/2295cb26a0/models/7c9dc1dcd8@12c41008e6

[linear]

CNX-765 Surfaces and regions are not published

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 9.31%. Comparing base (332ab25) to head (aab44d0).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #428   +/-   ##
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  Coverage   9.31%   9.31%           
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  Files        225     225           
  Lines       4263    4263           
  Branches     484     484           
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  Hits         397     397           
  Misses      3850    3850           
  Partials      16      16           

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[didimitrie]

I've tested this with the existing sample file; unsure what other things to look at. Had some initial comments, but nothing really worth dropping in here.