jpyinterpreter - Java annotation support

[Christopher-Chianelli]

Currently, timefold.solver is doing a lot of extra work just to add annotations (see https://github.com/TimefoldAI/timefold-solver-python/blob/main/timefold-solver-python-core/src/main/java/ai/timefold/solver/python/PythonWrapperGenerator.java). Ideally, the entire class can be removed if jpyinterpreter allows adding annotations to fields and methods.

Python supports annotations via Annotated: https://docs.python.org/3/library/typing.html#typing.Annotated , so

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

can be replaced with

class Entity:
    value: PlanningVariable(V | None)

    def __init__(self):
        self.value = None

(where PlanningVariable = lambda x: Annotated[x, JavaAnnotation(annotation_class=PlanningVariable.class)])

[Christopher-Chianelli]

Done by #23