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build(mypyc): make `_BoundFunction` native too (#289)

Follow-up to compiling `_function`. `Function.__get__` allocates a fresh
`_BoundFunction` on every bound-method access, so making `_BoundFunction` a
`mypyc` native class (rather than a non-native compiled one) speeds up
class-method dispatch substantially: `tests/benchmark.py` class calls and
class-attribute calls drop from ~4% faster to ~28-29% faster than pure Python,
matching the unbound path.

Same recipe as `Function`: drop `@mypyc_attr(native_class=False)`, declare every
instance attribute, and set `__name__`/`__qualname__`/`__wrapped__` explicitly in
`__init__`. The `_DocDescriptor`/`_ModuleDescriptor` are reused as-is (they
delegate to `instance._compute_doc()` / `instance._f.__module__`, both of which
`_BoundFunction` provides).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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