[whatwg/webidl] Add `toggle()` and `replace()` methods to `setlike` (Issue #1370)

### What is the issue with the Web IDL Standard?

It was suggested here that we could add methods like "replace" and "toggle" to bring setlike up to par with DOMTokenList: https://github.com/whatwg/html/pull/8467#discussion_r1025883232

@annevk @domenic

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