rename 'mutable' field on property structs to 'readonly'

[codecov[bot]]

Codecov Report

Merging #693 (5d361cc) into main (c32cae3) will increase coverage by 0.10%. The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main     #693      +/-   ##
==========================================
+ Coverage   89.41%   89.51%   +0.10%     
==========================================
  Files         112      112              
  Lines       25235    25237       +2     
==========================================
+ Hits        22563    22592      +29     
+ Misses       2672     2645      -27     

Files Changed	Coverage Δ
crates/escalier_ast/src/type_ann.rs	100.00% <ø> (ø)
crates/escalier_hm/src/types.rs	82.03% <75.00%> (-0.10%)	:arrow_down:
crates/escalier_codegen/src/d_ts.rs	78.77% <100.00%> (+3.81%)	:arrow_up:
crates/escalier_hm/src/infer.rs	91.89% <100.00%> (ø)
crates/escalier_hm/src/infer_pattern.rs	92.76% <100.00%> (ø)
crates/escalier_hm/src/unify.rs	84.79% <100.00%> (ø)
crates/escalier_hm/src/util.rs	80.33% <100.00%> (ø)
crates/escalier_interop/src/parse.rs	91.59% <100.00%> (-0.02%)	:arrow_down:
crates/escalier_parser/src/type_ann_parser.rs	95.53% <100.00%> (ø)

... and 4 files with indirect coverage changes

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