Implement equality check

[frectonz]

Potential implementation of #229
I used the regular rust way of PartialEq and Eq to check for equality.

[codecov]

Codecov Report

Attention: Patch coverage is 68.75000% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 83.30%. Comparing base (7dce963) to head (c3e7795).

Files	Patch %	Lines
core/src/ast.rs	38.09%	13 Missing ⚠️
core/src/num/unit.rs	40.00%	3 Missing ⚠️
core/src/lexer.rs	71.42%	2 Missing ⚠️
core/src/scope.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   83.37%   83.30%   -0.07%     
==========================================
  Files          52       52              
  Lines       14668    14721      +53     
==========================================
+ Hits        12229    12264      +35     
- Misses       2439     2457      +18     

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[printfn]

I think a custom PartialEq/Eq impl would be better. We should be able to ignore the ‘base’, ‘exact’, ‘format’ and ‘simplifiable’ fields. It would also be nice to take units into account, so that e.g. 2m is equal to 200cm.

[frectonz]

My latest commit implements comparing values with different units although i haven't tested it thoroughly.

[printfn]

Wow, you’re on a roll with all the things you’ve been implementing recently. Thanks so much for all your work!! I’ve left a small comment to improve the equality checks a bit, but otherwise your implementation looks excellent!

[frectonz]

thanks for the kind words 🙏 and btw i also implemented inequality

[frectonz]

Comparisons of different units is now implemented 🎉