feat(core): Make module transforms optional via feature flag
Make it easy to exclude `swc_ecma_transforms_module` from the final binary by making it an optional feature that must be explicitly enabled.
Changes:
- Add `module` feature to swc crate that enables module transforms
- Enable `module` feature by default in swc_core's `__base` feature
- Update binding_core_node to enable `ecma_transforms_module` feature
- Update binding_core_wasm to enable `ecma_transforms_module` feature
- Add conditional compilation for module-related code throughout swc crate
This allows bundler projects to exclude unused module transforms, reducing binary size.
Fixes #11505
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>