Add new escalier_interop crate

[codecov[bot]]

Codecov Report

Merging #687 (012ead4) into main (774cba4) will increase coverage by 0.09%. The diff coverage is 90.46%.

@@            Coverage Diff             @@
##             main     #687      +/-   ##
==========================================
+ Coverage   88.86%   88.95%   +0.09%     
==========================================
  Files         109      112       +3     
  Lines       24188    25124     +936     
==========================================
+ Hits        21494    22349     +855     
- Misses       2694     2775      +81     

Files Changed	Coverage Δ
crates/escalier_ast/src/type_ann.rs	100.00% <ø> (ø)
crates/escalier_codegen/src/js.rs	66.48% <0.00%> (ø)
crates/escalier_parser/src/lib.rs	100.00% <ø> (ø)
crates/escalier_codegen/src/d_ts.rs	62.51% <50.00%> (-0.10%)	:arrow_down:
crates/escalier_parser/src/type_ann_parser.rs	95.41% <70.00%> (-0.39%)	:arrow_down:
crates/escalier_hm/src/infer.rs	91.83% <83.33%> (-0.09%)	:arrow_down:
crates/escalier_hm/src/types.rs	81.04% <86.20%> (+0.36%)	:arrow_up:
crates/escalier_hm/src/unify.rs	82.96% <87.50%> (+0.20%)	:arrow_up:
crates/escalier_hm/src/util.rs	78.29% <88.00%> (+0.70%)	:arrow_up:
crates/escalier_interop/src/util.rs	90.85% <90.85%> (ø)
... and 4 more

... and 4 files with indirect coverage changes