New Lexer

[regeda]

The lexer generates a syntax tree during the input parsing.

Introduce math operators

[codecov-commenter]

Codecov Report

Merging #10 (87b519b) into main (6cf8a10) will increase coverage by 45.15%.
The diff coverage is 79.72%.

@@             Coverage Diff             @@
##             main      #10       +/-   ##
===========================================
+ Coverage   48.82%   93.98%   +45.15%     
===========================================
  Files          19       17        -2     
  Lines         977     3721     +2744     
===========================================
+ Hits          477     3497     +3020     
+ Misses        487      209      -278     
- Partials       13       15        +2     

Impacted Files	Coverage Δ
lexer/init.go	0.00% <0.00%> (ø)
lexer/lexer.go	96.23% <ø> (ø)
memory/addr.go	100.00% <ø> (ø)
lexer/node.go	63.63% <63.63%> (ø)
exec/vm.go	72.17% <80.39%> (+4.70%)	⬆️
lexer/nvec.go	100.00% <100.00%> (ø)
memory/memory.go	80.43% <100.00%> (ø)
... and 2 more

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