perf(core): use BTreeMap for GothamState (#10073)

This commit replaces GothamState's internal HashMap 
with a BTreeMap to improve performance.

OpState/GothamState keys by TypeId which is essentially 
an opaque u64. For small sets of integer keys BTreeMap 
outperforms HashMap mainly since it removes the hashing 
overhead and Eq/Comp on integer-like types is very cheap, 
it should also have a smaller memory footprint.

We only use ~30 unique types and thus ~30 unique keys to 
access OpState, so the keyset is small and immutable 
throughout the life of a JsRuntime, there's no meaningful 
churn in keys added/removed.

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