Expand str_as_str to more types

[GrigorenkoPV]

Tracking issue: #130366
ACP: rust-lang/libs-team#643

This PR expands str_from_str feature and adds analogous methods to more types. Namely:

• &CStr
• &[T], &mut [T]
• &OsStr
• &Path
• &ByteStr, &mut ByteStr (tracking issue: Tracking Issue for ByteStr/ByteString #134915) (technically was not part of ACP)

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[GrigorenkoPV]

@rustbot label -S-waiting-on-ACP +T-libs
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r?

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[joboet]

Looks fine, but I'd also add &mut variants for Path, OsStr and CStr if that's fine for T-libs-api.

r? libs-api