Rollup merge of #136922 - oli-obk:pattern-types-option-ends, r=BoxyUwU

Pattern types: Avoid having to handle an Option for range ends in the type system or the HIR

Instead,

1. during hir_ty_lowering, we now generate constants for the min/max when the range doesn't have a start/end specified.
2. in a later commit we generate those constants during ast lowering, simplifying everything further by not having to handle the range end inclusivity anymore in the type system (and thus avoiding any issues of `0..5` being different from `0..=4`

I think it makes all the type system code simpler, and the cost of the extra `ConstKind::Value` processing seems negligible.

r? `@BoxyUwU`

cc `@joshtriplett` `@scottmcm`

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