Extend lexer and parser with error reporting mechanism

[exellentcoin26]

No description provided.

[codecov]

Codecov Report

Merging #5 (7880602) into main (4eda37a) will decrease coverage by 2.0%.
The diff coverage is 37.6%.

@@           Coverage Diff           @@
##            main      #5     +/-   ##
=======================================
- Coverage   87.1%   85.2%   -2.0%     
=======================================
  Files         23      26      +3     
  Lines       2949    3052    +103     
  Branches    2949    3052    +103     
=======================================
+ Hits        2571    2602     +31     
- Misses       320     390     +70     
- Partials      58      60      +2     

Files	Coverage Δ
pango-lexer/src/lexer/input.rs	93.8% <100.0%> (+0.2%)	⬆️
pango-lexer/src/regex/tokenizer.rs	89.0% <100.0%> (+<0.1%)	⬆️
pango-parser/src/cfsm/item.rs	93.3% <100.0%> (-0.2%)	⬇️
pango-parser/src/grammar.rs	96.0% <100.0%> (+0.1%)	⬆️
pango-lexer/src/fsm/nfa/model.rs	82.0% <66.6%> (ø)
pango-parser/src/lib.rs	60.0% <75.0%> (+60.0%)	⬆️
pango-lexer/src/lexer/mod.rs	88.5% <87.5%> (-0.5%)	⬇️
pango-parser/src/parser/error.rs	0.0% <0.0%> (ø)
pango-lexer/src/lexer/error.rs	0.0% <0.0%> (ø)
pango-parser/src/cfsm/dot.rs	0.0% <0.0%> (ø)
... and 4 more

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