feat(jambo): Add oneOf parser (#5)

* Add support for `oneOf` type parsing with validation and example cases

* Improve `oneOf` type parsing: refine validators, add discriminator support, and expand test coverage

* Add hashable and non-hashable value support to `ConstTypeParser` with expanded test cases

* Refine `field_props` check in `_type_parser` for cleaner default handling

* Update `StringTypeParser` to refine `format` handling and enrich `json_schema_extra`

* Remove outdated `oneOf` examples from docs, expand test cases and provide refined examples with discriminator support

jambo/parser/__init__.py

@@ -9,6 +9,7 @@ from .float_type_parser import FloatTypeParser
 from .int_type_parser import IntTypeParser
 from .null_type_parser import NullTypeParser
 from .object_type_parser import ObjectTypeParser
+from .oneof_type_parser import OneOfTypeParser
 from .ref_type_parser import RefTypeParser
 from .string_type_parser import StringTypeParser
 
@@ -25,6 +26,7 @@ __all__ = [
     "IntTypeParser",
     "NullTypeParser",
     "ObjectTypeParser",
+    "OneOfTypeParser",
     "StringTypeParser",
     "RefTypeParser",
-]
+]