Release 0.3.0

• feat: add hex rule (9f76bbd)
• feat: add hash rule (a822e95)
• feat: add positive, negative, and range to number-related rules (94d235f)
• refactor: document limited non-Bun support (c72ad19)
• refactor: use enums for IP and UUID versions (7a434c7)
• refactor: non-required rules now yield a T | undefined return type (02f66dc)
• feat: add new options for various rules, greatly improve types (a96dd65)
• refactor: improve type for enum rule, eliminating need for explicit as const (c903fc7)
• refactor: remove defunct format option from string rule (098bdef)