Adds the limit for the deferred stream's queue size

[vdeweb]

Fixes the issue with streaming: if the rate of consuming data by the client is slower than the rate of streaming data by the server, the server prefetches too much data from the source.

Proposed solution is to limit the queue size (size of the result buffer) in DeferredWorkState.

Changes:

• size of the queue in DeferredWorkState has a limit now;
• action of registering DeferredExecutionTask is unbound from its starting with new TaskDispatcher class;
• previous DeferredExecutionTask has to complete before starting the new one in DeferredStream.

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (acffe7b) 73.15% compared to head (0decfd5) 73.13%. Report is 4 commits behind head on main.

Files	Patch %	Lines
...te/Core/src/Execution/Processing/DeferredStream.cs	0.00%	8 Missing :warning:
...escriptors/Conventions/XmlDocumentationProvider.cs	0.00%	8 Missing :warning:
...Core/src/Execution/Processing/DeferredWorkState.cs	81.25%	3 Missing :warning:
...cyInjection/InternalServiceCollectionExtensions.cs	75.00%	2 Missing :warning:
.../src/Execution/Processing/DeferredWorkScheduler.cs	66.66%	2 Missing :warning:
...Execution/Processing/Tasks/ResolverTask.Execute.cs	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6852      +/-   ##
==========================================
- Coverage   73.15%   73.13%   -0.02%     
==========================================
  Files        2499     2499              
  Lines      126162   126170       +8     
==========================================
- Hits        92292    92273      -19     
- Misses      33870    33897      +27     

Flag	Coverage Δ
unittests	73.13% <55.35%> (-0.02%)	:arrow_down:

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[michaelstaib]

We still have this on the back log. I will soon start work on the defer / stream part and then we will have a look at this.