Calculate closures correctly

[adamhathcock]

get depths for sending so we can order by depth when receiving

[linear]

WEB-3379 C# SDK needs to correctly calculate closures

[codecov]

Codecov Report

Attention: Patch coverage is 97.00855% with 7 lines in your changes missing coverage. Please review.

Project coverage is 75.16%. Comparing base (0f8752d) to head (5b92a85).

Files with missing lines	Patch %	Lines
...c/Speckle.Sdk/Serialisation/V2/Send/ClosureMath.cs	77.77%	4 Missing ⚠️
...ckle.Sdk/Serialisation/V2/Send/ObjectSerializer.cs	93.33%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #309       +/-   ##
===========================================
+ Coverage   63.78%   75.16%   +11.37%     
===========================================
  Files         267      288       +21     
  Lines       10673    11635      +962     
  Branches     1102     1114       +12     
===========================================
+ Hits         6808     8745     +1937     
+ Misses       3571     2513     -1058     
- Partials      294      377       +83     

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