Add native stack size control and pool invalidation on resize

[bragaigor]

• Add a thread-local stack size override (set_thread_stack_size / get_thread_stack_size) so individual threads (e.g. the Stylus retry loop) can request a larger coroutine stack without affecting other threads
• Make the stack pool size-aware: pooled stacks are tagged with their allocation size and undersized entries are skipped during reuse, preventing a thread requesting a large stack from getting a small one
• Extract MAX_STACK_SIZE constant and get_stack_size() getter as public API
• Propagate stack allocation failures as Trap::OOM instead of panicking

pulled by OffchainLabs/nitro#4538
part of NIT-4686

[bragaigor]

closing in pro of #37