Pass a mrc.Subscription object to sources rather than a mrc.Subscriber

[dagardner-nv]

Description

• Remove the make_source_subscriber method in favor of inspecting the Python function signature.
• Since the make_source_subscriber method was never part of a release I think this can still be considered a non-breaking change.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[dagardner-nv]

/merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.10%. Comparing base (ccbcd76) to head (e9ea972).
Report is 1 commits behind head on branch-24.10.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.10     #499      +/-   ##
================================================
- Coverage         74.12%   74.10%   -0.03%     
================================================
  Files               403      403              
  Lines             14424    14439      +15     
  Branches           1135     1136       +1     
================================================
+ Hits              10692    10700       +8     
- Misses             3732     3739       +7     

Flag	Coverage Δ
cpp	70.60% <8.69%> (-0.12%)	⬇️
py	42.65% <100.00%> (+0.05%)	⬆️

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

Files with missing lines	Coverage Δ
python/mrc/_pymrc/include/pymrc/segment.hpp	62.50% <ø> (ø)
python/mrc/_pymrc/src/segment.cpp	81.67% <100.00%> (+1.44%)	⬆️
python/mrc/_pymrc/src/subscriber.cpp	27.27% <100.00%> (-1.03%)	⬇️
python/mrc/core/segment.cpp	95.74% <ø> (-0.09%)	⬇️
python/mrc/core/subscriber.cpp	88.46% <100.00%> (+0.46%)	⬆️

... and 4 files with indirect coverage changes

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