Add initial grammar for impl blocks and optimize grammar [3]

[edg-l]

Initial grammar for impl blocks

Depends on #152

[github-actions]

Benchmarking factorial

Compiling factorial (factorial.con)
Finished release in 30.811412ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 59.35 ms
Rust Result = 2432902008176640000 Time taken : 60.38 ms

Benchmarking fib

Compiling fib (fib.con)
Finished release in 26.116828ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 136.69 ms
Rust Result = 6765 Time taken : 86.16 ms

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 15.38462% with 11 lines in your changes missing coverage. Please review.

Project coverage is 62.54%. Comparing base (d854690) to head (5d075e0).

Files with missing lines	Patch %	Lines
src/ir/lowering.rs	18.18%	9 Missing ⚠️
src/ir/lowering/prepass.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   62.70%   62.54%   -0.16%     
==========================================
  Files          20       20              
  Lines        4673     4680       +7     
==========================================
- Hits         2930     2927       -3     
- Misses       1743     1753      +10     

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[juanbono]

Can you add some tests?

[edg-l]

Can you add some tests?

they are added in the next pr