Store `Semantic` data in arena

[overlookmotel]

Semantic's data structures seem like a good candidate for arena allocation - lots of small structures built in a short space of time and then dropped simultaneously (much like the AST itself).

Semantic<'a> already has a lifetime, so moving the data into arena would not affect ergonomics of API.

The one downside of the arena allocator is that Vecs never grow in place, they always reallocate and are copied when they grow beyond capacity, because bumpalo packs data tightly and grows downwards.

This problem could be largely ameliorated if:

• Parser counts number of scopes, symbols and references during parsing.
• Initialize ScopeTree's Vecs with required capacity at the start, so they never need to grow.

Additional benefits:

• Storing semantic data in arena makes it available in JS via AST transfer (for building e.g. linter rules / transform plugins in JS).
• Ditto for https://github.com/oxc-project/oxc/discussions/3079 (if we want to do that)

[overlookmotel]

We should probably store Semantic in a separate arena from AST itself, so AST remains compact in memory.

oxc_allocator::Allocator could contain both arenas:

struct Allocator {
  ast_arena: bumpalo::Bump,
  semantic_arena: bumpalo::Bump,
}