Implements a decorator to facilitate creating table-driven unit tests.

[fressi-elastic]

This implements the tool required in issue #1921

Implements a decorator to facilitate creating table-driven unit tests (https://go.dev/wiki/TableDrivenTests).

Example of use:

@dataclass
class SumCase:
    values: list[int]
    want: int


@cases(
    no_values=SumCase(values=[], want=0),
    two_values=SumCase(values=[1, 2], want=3),
)
def test_sum(case: SumCase):
    assert sum(case.values) == case.want

[gbanasiak]

LGTM