Closures are kept for children instead of global

[adamhathcock]

• closures are kept only for parents
• no more global collection
• now can pool closures as well as lists for data chunks

[codecov]

Codecov Report

Attention: Patch coverage is 90.32258% with 15 lines in your changes missing coverage. Please review.

Project coverage is 66.58%. Comparing base (722df50) to head (285d7b6).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ckle.Sdk/Serialisation/V2/Send/SerializeProcess.cs	86.84%	5 Missing ⚠️
...kle.Sdk.Dependencies/Serialization/ChannelSaver.cs	85.71%	1 Missing and 3 partials ⚠️
...eckle.Sdk/Serialisation/V2/Receive/ObjectLoader.cs	25.00%	3 Missing ⚠️
...k/Serialisation/V2/DummySendServerObjectManager.cs	0.00%	1 Missing ⚠️
...s/Speckle.Sdk.Serialization.Tests/DetachedTests.cs	0.00%	1 Missing ⚠️
...alization.Tests/DummyReceiveServerObjectManager.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #189       +/-   ##
===========================================
+ Coverage   53.91%   66.58%   +12.67%     
===========================================
  Files         236      252       +16     
  Lines        9436    10154      +718     
  Branches     1065     1075       +10     
===========================================
+ Hits         5087     6761     +1674     
+ Misses       4097     3046     -1051     
- Partials      252      347       +95     

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[didimitrie]

@adamhathcock said i'm getting murdered if i do not approve, so approving