Add Lexer::parse method to explicit call parser methods

[MauricioFauth]

Removes the Lexer::PARSER_METHODS constant.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e9edd4c) 96.43% compared to head (147f470) 96.43%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #514   +/-   ##
=========================================
  Coverage     96.43%   96.43%           
+ Complexity     2148     2147    -1     
=========================================
  Files            65       65           
  Lines          5014     5022    +8     
=========================================
+ Hits           4835     4843    +8     
  Misses          179      179           

Files	Coverage Δ
src/Lexer.php	99.74% <100.00%> (+<0.01%)	⬆️

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