use with_capacity to reduce re-allocations fixes #3896

[jasonwilliams]

This PR attempts to address #3896

We already raised the threshold, but it would be good to not re-allocate the hashmaps and vectors as we will up the property storage during startup.

It doesn't seem to have much noticeable affect in the performance profiler but DHAT shows less grow_one calls from boa_engine::object::shape::property_table::PropertyTableInner::insert (object/shape/property_table.rs:70:9), there are still some, we may be able to find these by checking .len() == .capacity() and tracing back where these are coming from

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.87%. Comparing base (6ddc2b4) to head (346b42f).
Report is 244 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/context/icu.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3961      +/-   ##
==========================================
+ Coverage   47.24%   51.87%   +4.62%     
==========================================
  Files         476      468       -8     
  Lines       46892    45307    -1585     
==========================================
+ Hits        22154    23501    +1347     
+ Misses      24738    21806    -2932     

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[raskad]

I'd be for merging this. I ran the benchmarks locally and there are no significant changes overall.

[HalidOdat]

Besides the comment, this looks good to me! :)