Source proxy tests

[knoepfel]

This PR tests:

• The simplest composite workflow (one channel depending on another)
• A more realistic workflow (multi-tiered channel hierarchy)

This tests work in the "old" system with the source proxy, and the "new" system where there is no source proxy, but the workflow is assembled through configuration-combination utilities.

[pep8speaks]

Hello @knoepfel! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2021-10-14 15:14:28 UTC

[codecov[bot]]

Codecov Report

Merging #541 (39ac7a2) into master (30951a5) will increase coverage by 0.35%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
+ Coverage   84.12%   84.48%   +0.35%     
==========================================
  Files          48       48              
  Lines        3100     3100              
  Branches      482      482              
==========================================
+ Hits         2608     2619      +11     
+ Misses        460      450      -10     
+ Partials       32       31       -1     

Flag	Coverage Δ
python-3.10	83.96% <100.00%> (+0.35%)	:arrow_up:
python-3.6	83.75% <100.00%> (+0.32%)	:arrow_up:
python-pypy-3.7	83.68% <100.00%> (+0.09%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ecisionengine/framework/taskmanager/TaskManager.py	96.48% <100.00%> (ø)
...rc/decisionengine/framework/modules/SourceProxy.py	86.95% <0.00%> (+15.94%)	:arrow_up:

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