Fix sending caching

[adamhathcock]

Part of https://linear.app/speckle/issue/CXPLA-143/sdk-slow-on-caching-and-general-sending

Fixed:

• calculation of upload speed

Changed:

• how progress looks: do all of serialize first and calculate tree ASAP. Then show upload/caching left only when serialization is done

[linear]

CXPLA-143 SDK slow on caching and general sending

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 9.43%. Comparing base (0341ebc) to head (0f7c55b).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...eckle.Connectors.Common/Operations/SendProgress.cs	0.00%	15 Missing ⚠️
...onnectors.Common/Operations/PassthroughProgress.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             dev    #441      +/-   ##
========================================
- Coverage   9.45%   9.43%   -0.03%     
========================================
  Files        223     223              
  Lines       4199    4209      +10     
  Branches     483     487       +4     
========================================
  Hits         397     397              
- Misses      3786    3796      +10     
  Partials      16      16              

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[adamhathcock]

Requires new SDK #441

[JR-Morgan]

tested in revit

[JR-Morgan]