`Extend<&str>` and `FromIterator<&str>` for String

We can now implement Extend<&str> and FromIterator<&str> in parallel with the existing char variants of these traits for String.

We should probably do this since we already use &str as particles of a string – see the graphemes iterator. Does it need an RFC?

This is not a language change,so I would say it does not need an RFC.

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