Add offset field to lexer

[dhruvrajvanshi]

No description provided.

[codecov]

Codecov Report

Merging #155 (ca9467b) into master (a2a316a) will increase coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head ca9467b differs from pull request most recent head be3658d. Consider uploading reports for the commit be3658d to get more accurate results

@@             Coverage Diff              @@
##             master     #155      +/-   ##
============================================
+ Coverage     82.28%   82.32%   +0.03%     
- Complexity     1904     1908       +4     
============================================
  Files            91       91              
  Lines          9271     9280       +9     
  Branches       1960     1960              
============================================
+ Hits           7629     7640      +11     
+ Misses          854      853       -1     
+ Partials        788      787       -1     

Impacted Files	Coverage Δ
hadesboot/src/main/kotlin/hadesc/ast/SourceFile.kt	100.00% <100.00%> (ø)
hadesboot/src/main/kotlin/hadesc/parser/Lexer.kt	94.02% <100.00%> (+0.59%)	⬆️
hadesboot/src/main/kotlin/hadesc/parser/Parser.kt	90.22% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes

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