Add str::{Split,RSplit,SplitN,RSplitN,SplitTerminator,RSplitTerminator,SplitInclusive}::as_str methods - #75265

Add str::{Split,RSplit,SplitN,RSplitN,SplitTerminator,RSplitTerminator,SplitInclusive}::as_str methods#75265

bors merged 4 commits into

rust-lang:masterrust-lang/rust:masterfrom

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