refactor!: remove Model interface

[redeboer]

This PR removes the Model interface and related implementations. The interface was introduced with the idea to implement different types of expression trees later on (see ADR-001), but this seems to be a premature optimisation. For now, the Function interface suffices: Function instances can be created through specific functions.

Some major changes:

• The Model interface and its implementation SympyModel have been removed
• tensorwaves.model has been renamed to tensorwaves.function
• There is no way to use performance_optimize() (for now—see Re-implement performance optimization #358)

This means that the workflow becomes:

# helicity_model: ampform.helicity.HelicityModel
function = create_parametrized_function(
    expression=helicity_model.expression.doit(),
    parameters=helicity_model.parameter_defaults,
    backend="numpy",
)

instead of

model = SympyModel(
    expression=helicity_model.expression.doit(),
    parameters=helicity_model.parameter_defaults,
    max_complexity=max_complexity,
)
function = LambdifiedFunction(model, backend="numpy")

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