Implement owned ops for `HashSet` and `BTreeSet`#109402

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WaffleLapkin wants to merge 3 commits intorust-lang:masterfrom

WaffleLapkin:set_owned_sub

Commits on Mar 20, 2023

Drive-by cleanup: simplify documentation of `HashSet` ops
WaffleLapkin
committed
Add implementations of `ops` for `HashSet` that keep ownership
WaffleLapkin
committed
Add implementations of `ops` for `BTreeSet` that keep ownership
WaffleLapkin
committed