[Rust] Release 0.30.0

Added

• JsonType and JsonTypeSet.
• ValidationOptions::with_base_uri that allows for specifying a base URI for all relative references in the schema.
• Configuration options for the underlying regex engine used by pattern and patternProperties keywords.

Changed

• Better error messages for relative $ref without base URI.

Fixed

• CLI: Inability to load relative file $ref. #725

Removed

• Internal cache for regular expressions.

Deprecated

• PrimitiveType and PrimitiveTypesBitMap.