Allow self-referencing product blocks

[Mark90]

Closes #108 by using get_type_hints() which evaluates any ForwardRef types to the actual type

[codecov-commenter]

Codecov Report

Merging #112 (7fd00da) into main (3d64546) will increase coverage by 0.04%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   83.02%   83.06%   +0.04%     
==========================================
  Files          88       88              
  Lines        5018     5024       +6     
  Branches      830      832       +2     
==========================================
+ Hits         4166     4173       +7     
+ Misses        705      704       -1     
  Partials      147      147              

Impacted Files	Coverage Δ
orchestrator/services/processes.py	90.25% <75.00%> (-1.13%)	⬇️
orchestrator/domain/base.py	84.33% <100.00%> (+0.76%)	⬆️

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[pboers1988]

Looks good 👍🏼

[pboers1988]

Is this only called in the tests?

[Mark90]

Yes, a testcase I added some time ago to test_processes.py (for the resume-all endpoint) turned out to be flaky, as it didn't wait for async tasks to complete.

Adding shutdown_thread_pool() function is the easiest solution for it - the alternative being to patch the threadpoolexecutor, capture .submit() calls and calling .result() on each return value..

I was thinking the threadpool shutdown could/should be used during FastAPI's shutdown, to prevent disconnecting from the DB before all async tasks have concluded. Which has a very small chance of happening, but who knows. :)