chore: deprecate utils method and private methods in parsers

[stevenhua0320]

@sbillinge ready to review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.13%. Comparing base (f489b30) to head (6286234).
⚠️ Report is 4 commits behind head on v3.4.0.

Additional details and impacted files

@@           Coverage Diff           @@
##           v3.4.0     #172   +/-   ##
=======================================
  Coverage   99.12%   99.13%           
=======================================
  Files          13       14    +1     
  Lines        2291     2301   +10     
=======================================
+ Hits         2271     2281   +10     
  Misses         20       20           

Files with missing lines	Coverage Δ
tests/test_utils.py	100.00% <100.00%> (ø)

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