python-based providers

[wlav]

Python-based providers in a similar vein as transform/observe. This code will need some refactoring once converters are separated out; in particular, sources and modules currently live in modulewrap.cpp because both need access to the converters (which are not public). Note that for the same reasons as with transforms, when a Python provider returns a numpy array, the data will currently be copied.

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
plugins/python/src/modulewrap.cpp	88.65%	10 Missing and 12 partials ⚠️
plugins/python/src/pymodule.cpp	63.04%	7 Missing and 10 partials ⚠️

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
+ Coverage   84.88%   85.25%   +0.37%     
==========================================
  Files         127      142      +15     
  Lines        3340     3541     +201     
  Branches      575      610      +35     
==========================================
+ Hits         2835     3019     +184     
- Misses        308      314       +6     
- Partials      197      208      +11     

Flag	Coverage Δ
unittests	85.25% <84.21%> (+0.37%)	⬆️

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

Files with missing lines	Coverage Δ
phlex/app/load_module.cpp	86.04% <100.00%> (ø)
plugins/python/src/configwrap.cpp	85.56% <ø> (ø)
plugins/python/src/dciwrap.cpp	100.00% <100.00%> (ø)
plugins/python/src/wrap.hpp	100.00% <ø> (ø)
plugins/python/src/pymodule.cpp	58.58% <63.04%> (-2.23%)	⬇️
plugins/python/src/modulewrap.cpp	78.66% <88.65%> (+1.97%)	⬆️

... and 50 files with indirect coverage changes

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