feat(revit): extracts collection creation logic out into SendCollectionManager

[didimitrie]

Several things:

• Cleans up root object builder a bit in revit. Had potential to get messy.
• Fully cleans up hosted element convertor

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 8.31%. Comparing base (d25272f) to head (85d28db).

Files	Patch %	Lines
...ckle/TopLevel/ElementTopLevelConverterToSpeckle.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #142   +/-   ##
=====================================
  Coverage   8.31%   8.31%           
=====================================
  Files        232     232           
  Lines       4332    4332           
  Branches     491     491           
=====================================
  Hits         360     360           
  Misses      3962    3962           
  Partials      10      10           

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[oguzhankoral]

Nice!