Improve parser logic and performance

[CohenArthur]

This PR is the culmination of multiple PRs which have already been reviewed individually

[codecov-commenter]

Codecov Report

Merging #374 (5d3fecc) into master (fe0b802) will decrease coverage by 1.25%.
The diff coverage is 97.82%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   92.82%   91.57%   -1.26%     
==========================================
  Files          42       37       -5     
  Lines        4208     3892     -316     
==========================================
- Hits         3906     3564     -342     
- Misses        302      328      +26     

Impacted Files	Coverage Δ
src/instruction/mod.rs	67.64% <ø> (ø)
src/instruction/type_declaration.rs	86.95% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/utils.rs	85.71% <ø> (ø)
src/instruction/field_access.rs	76.66% <63.63%> (-2.50%)	⬇️
src/value/jk_constant.rs	90.27% <66.66%> (-1.03%)	⬇️
src/instruction/function_declaration.rs	87.50% <77.77%> (-2.45%)	⬇️
src/instruction/operator.rs	80.64% <87.50%> (-9.98%)	⬇️
src/instruction/binary_op.rs	89.36% <95.12%> (+1.95%)	⬆️
src/instruction/block.rs	95.31% <97.50%> (-3.90%)	⬇️
... and 30 more

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[SanderJSA]

What an adventure, thanks for letting me be part of this !