feat: Allow jpyinterpreter to create annotations on classes, fields and methods

[Christopher-Chianelli]

Part 1 of #14. This gives jpyinterpreter the ability to directly add Java annotations to the generated fields/methods/classes with the use of Annotated (see https://docs.python.org/3/library/typing.html#typing.Annotated).

Part 2 of #14 would be a complete do-over of timefold-solver-python-core that removes the majority of its java class generation code (most of which is just adding annotations) and change its API to use Annotations:

@planning_entity
class Entity:
    value: V | None

    def __init__(self):
        self.value = None

    @planning_variable(V)
    def get_value(self):
        return self.value

    def set_value(self, value):
        self.value = value

becomes

@planning_entity
@dataclass
class Entity:
    value: PlanningVariable(V)

or

@planning_entity
@dataclass
class Entity:
    value: Annotated[V, PlanningVariable()]

• Fields annotations are created using Annotated in type hints
• Method annotations are created using Annotated in a method's return type hints
• Class annotations are created using a decorator which stores the annotation in a dict
• Changed values in type hint dictionary from PythonLikeType to TypeHint
• TypeHint is a record containing the type and any Java annotations
• Java annotations are stored as instances of AnnotationMetadata, a record containing the annotation type and value of its attributes

[Christopher-Chianelli]

Example from Django: https://docs.djangoproject.com/en/5.0/topics/db/models/#quick-example ; it important to note: here PlanningVariable acts as a type (hence PascalCase), where before it acts as a function (hence snake_case).

[Christopher-Chianelli]

Example from Pydantic: https://docs.pydantic.dev/latest/api/standard_library_types/#decimaldecimal

[Christopher-Chianelli]

Example from FastAPI: https://fastapi.tiangolo.com/tutorial/dependencies/?h=annotated#first-steps