Add the pipe operator |>

[jmackie]

• Add parsing logic for binary operators (initially just the |> operator) to ditto-cst
• Desugar pipes as part of the "pre-AST" generation in ditto-checker
• Extend the expression formatting logic in ditto-fmt
• Ensure the generated JavaScript is as expected

[codecov]

Codecov Report

Merging #41 (d2a2f3d) into main (b2b1256) will increase coverage by 0.16%.
The diff coverage is 91.30%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   77.59%   77.76%   +0.16%     
==========================================
  Files         108      109       +1     
  Lines        6674     6742      +68     
==========================================
+ Hits         5179     5243      +64     
- Misses       1495     1499       +4     

Impacted Files	Coverage Δ
crates/ditto-cst/src/parser/token.rs	94.59% <ø> (ø)
crates/ditto-cst/src/token.rs	92.85% <ø> (ø)
crates/ditto-fmt/src/has_comments.rs	45.67% <14.28%> (-1.10%)	⬇️
...ditto-checker/src/module/value_declarations/mod.rs	99.19% <100.00%> (+<0.01%)	⬆️
crates/ditto-checker/src/typechecker/pre_ast.rs	96.66% <100.00%> (+0.30%)	⬆️
.../ditto-checker/src/typechecker/tests/right_pipe.rs	100.00% <100.00%> (ø)
crates/ditto-cst/src/get_span.rs	94.36% <100.00%> (+0.08%)	⬆️
crates/ditto-cst/src/parser/expression.rs	100.00% <100.00%> (ø)
crates/ditto-fmt/src/expression.rs	99.61% <100.00%> (+0.02%)	⬆️
crates/ditto-fmt/src/token.rs	97.89% <100.00%> (+0.02%)	⬆️
... and 1 more

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