chore: deprecate getParser method across all parsers format.

[stevenhua0320]

@sbillinge ready to review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.15%. Comparing base (70aa675) to head (810ef8a).
⚠️ Report is 4 commits behind head on v3.4.0.

Additional details and impacted files

@@           Coverage Diff           @@
##           v3.4.0     #176   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files          14       14           
  Lines        2359     2359           
=======================================
  Hits         2339     2339           
  Misses         20       20           

Files with missing lines	Coverage Δ
tests/test_p_cif.py	99.69% <100.00%> (ø)

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[sbillinge]

this got conflicted. It looks similar to the PR I just merged so I am not sure what happened

[stevenhua0320]

@sbillinge I have reviewed it, it is because of the incoming toLines setting message for deprecation in P_discus.py, I accepted the change there and it is ready to merge.