[wrachwal]

Summary

• Add optional select_stop, monitor_down, and dynamic_call callbacks for resource types.
• Map them to the stop, down, and dyncall members of ErlNifResourceTypeInit.
• Register resource types with enif_init_resource_type.
• Expose compile-time callback detection flags through ResourcePtr<T>.
• Document callback prototypes, mappings, and static_assert usage.

Testing

Added tests covering:

• resource monitor notifications
• ERL_NIF_SELECT_STOP handling
• dynamic resource calls
• compile-time recognition of all callback prototypes

[wrachwal]

I rebased that patch onto v0.2.0 (try_decode - cool addition BTW).