Peter Jaszkowiak ffea65bf61 add new_range_api for RFC 3550
This includes a `From<legacy::RangeInclusive> for RangeInclusive` impl for convenience, instead of the `TryFrom` impl from the RFC.
Having `From` is highly convenient and the assertion is unlikely to be a problem in practice.

This includes re-exports of all existing `Range` types under `core::range`, plus the range-related traits (`RangeBounds`, `Step`, `OneSidedRange`) and the `Bound` enum.

Currently the iterators are just wrappers around the old range types,
and most other trait impls delegate to the old rage types as well.

Also includes an `.iter()` shorthand for `.clone().into_iter()`
2024-07-05 16:33:58 -06:00
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