Allow generic arguments in Expr::Call

[Y-Nak]

What was wrong?

fixes #379

How was it fixed?

1. Add BTParser which thinly wraps Parser and enables backtracking
2. Add generic_args to ast::Expr::Call
3. Add if_chain for improving readability

To-Do

• Change array type syntax to Array<u8, 100> #273

• OPTIONAL: Update Spec if applicable

• Add entry to the release notes (may forgo for trivial changes)

• Clean up commit history

[codecov-commenter]

Codecov Report

Merging #425 (f308afb) into master (d015b46) will increase coverage by 0.31%.
The diff coverage is 95.58%.

❗ Current head f308afb differs from pull request most recent head 7bf0403. Consider uploading reports for the commit 7bf0403 to get more accurate results

@@            Coverage Diff             @@
##           master     #425      +/-   ##
==========================================
+ Coverage   86.32%   86.64%   +0.31%     
==========================================
  Files          68       68              
  Lines        4109     4147      +38     
==========================================
+ Hits         3547     3593      +46     
+ Misses        562      554       -8     

Impacted Files	Coverage Δ
compiler/src/yul/mappers/expressions.rs	88.67% <ø> (ø)
parser/src/lexer.rs	86.20% <ø> (ø)
parser/src/lexer/token.rs	21.97% <ø> (ø)
analyzer/src/namespace/types.rs	85.31% <85.71%> (-0.09%)	⬇️
parser/src/parser.rs	74.07% <90.47%> (+1.55%)	⬆️
analyzer/src/traversal/expressions.rs	92.85% <100.00%> (+0.05%)	⬆️
compiler/src/lowering/mappers/expressions.rs	100.00% <100.00%> (ø)
parser/src/grammar/expressions.rs	88.97% <100.00%> (+0.64%)	⬆️
parser/src/grammar/types.rs	82.19% <100.00%> (+5.23%)	⬆️

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[sbillig]

@Y-Nak This looks really great. The BtParser idea is very elegant.