Re: [webcomponents] Replace attached/detached callbacks with insertedIntoDocument/removedFromDocument (#362)

During the meeting we claimed that "attach" and "detach" were unknowns, but note that we did introduce `attachShadowRoot()`. Of course, its semantics are quite a bit different so those might still be bad words to use here.

My preference here would be to use short names (e.g., `inserted` and `removed`), since if we suffix them with `Callback` they'll be long enough. Developers will find out soon enough when they fire or simply read it in the standard.

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