Module Constants

[JulianGCalderon]

closes #75

Adds support for simple literal constants:

mod Example {
	const foo: i32 = 10;
	const var: i64 = 5;

	fn main() -> i32 {
		let vix: i32 = foo + 5;
		return vix + (var as i32); // returns 20
	}
}

The constant reference is resolved in the IR, by replacing it by the constant value.

[github-actions]

Benchmarking factorial

Compiling factorial (factorial.con)
Finished release in 30.102087ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 62.82 ms
Rust Result = 2432902008176640000 Time taken : 61.87 ms

Benchmarking fib

Compiling fib (fib.con)
Finished release in 25.490309ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 135.98 ms
Rust Result = 6765 Time taken : 85.26 ms

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.88889% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 62.39%. Comparing base (bc72356) to head (350d3f6).

Files	Patch %	Lines
crates/concrete_ir/src/lowering.rs	68.88%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   61.97%   62.39%   +0.41%     
==========================================
  Files          25       25              
  Lines        4610     4696      +86     
==========================================
+ Hits         2857     2930      +73     
- Misses       1753     1766      +13     

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