1.1.12: Custom metadata support

This release adds support for custom metadata within field definitions. Metadata is specified as a dictionary:

@dataclass_struct
class Format:
    a: int = csfield(cs.Int8ub, metadata={"foo": "bar"))

---

What's Changed

• User-metadata for dataclass fields by @waszil in #2

Full Changelog: v1.1.11...v1.1.12