deprecate: pushFitHook, popFitHook, getFitHook, clearFitHook, and setWeight in FitRecipe

[cadenmyers13]

Did all these simultaneously because they are relatively easy deprecations.

[cadenmyers13]

@sbillinge ready for review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.73%. Comparing base (1e60597) to head (69ecbb5).
⚠️ Report is 19 commits behind head on v3.3.0.

Additional details and impacted files

@@            Coverage Diff             @@
##           v3.3.0     #151      +/-   ##
==========================================
+ Coverage   69.36%   69.73%   +0.36%     
==========================================
  Files          25       25              
  Lines        3457     3499      +42     
==========================================
+ Hits         2398     2440      +42     
  Misses       1059     1059              

Files with missing lines	Coverage Δ
tests/test_fitrecipe.py	99.78% <100.00%> (+0.01%)	⬆️

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