Add infinite values for dimensions

[EvanKirshenbaum]

Currently, given a dimension like Time, you can ask about Time.ZERO to get the zero value. It would be useful (and easy to support), to also be able to ask about Time.INFINITY (or Time.INF).

All that would be required would be to add the equivalent of ZERO support:

class NamedDimMeta(type, DimLike):
    @property
    def ZERO(self: Type[T]) -> T:
        val: T = getattr(self, "_zero")
        return val

    def __init__(self, name: str, base: tuple[Type, ...], dct: Mapping) -> None:  # @UnusedVariable 
        self._zero = self(0.0)
        self._restriction_classes: dict[Any, type[BaseDim]] = {}

Migrated from internal repository. Originally created by @EvanKirshenbaum on Feb 04, 2023 at 3:08 PM PST. Closed on Oct 06, 2023 at 10:18 AM PDT.

[EvanKirshenbaum]

This issue was referenced by the following commit before migration:

• d6662e9fe3e43b18e928704dd384fb5b4ee51803 by @EvanKirshenbaum on Feb 05, 2023 at 9:37 AM PST