[Codegen / Parsing] Add basic codegen for references, add parsing for arrays

[edg-l]

Depends on #79

• Adds basic codegen for references and dereferences
• Adds arrays to the ast and parser

The following program compiles and works:

mod Simple {
    fn main(argc: i64) -> i64 {
        let x: i64 = argc;
        return references(x) + dereference(&x);
    }

    fn dereference(a: &i64) -> i64 {
        return *a;
    }

    fn references(a: i64) -> i64 {
        let x: i64 = a;
        let y: &i64 = &x;
        return *y;
    }
}

[codecov-commenter]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (68423e9) 68.75% compared to head (a7bc019) 69.61%.

Files	Patch %	Lines
crates/concrete_codegen_mlir/src/codegen.rs	84.00%	20 Missing ⚠️
crates/concrete_driver/src/lib.rs	0.00%	5 Missing ⚠️
crates/concrete_ast/src/types.rs	71.42%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           add_imports      #81      +/-   ##
===============================================
+ Coverage        68.75%   69.61%   +0.86%     
===============================================
  Files               28       28              
  Lines             1309     1379      +70     
===============================================
+ Hits               900      960      +60     
- Misses             409      419      +10     

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The base branch was changed.