This changes the `ToTokens` implementations for expressions, statements, etc. with almost-trivial ones that produce `Interpolated(*Nt(...))` pseudo-tokens. In this way, quasiquote now works the same way as macros do: already-parsed AST fragments are used as-is, not reparsed.
The `ToSource` trait is removed. Quasiquote no longer involves pretty-printing at all, which removes the need for the `encode_with_hygiene` hack. All associated machinery is removed.
New `Nonterminal`s are added: NtArm, NtImplItem, and NtTraitItem. These are just for quasiquote, not macros.
`ToTokens` is no longer implemented for `Arg` (although this could be added again) and `Generics` (which I don't think makes sense).
This breaks any compiler extensions that relied on the ability of `ToTokens` to turn AST fragments back into inspectable token trees. For this reason, this closes#16987.
As such, this is a [breaking-change].
Fixes#16472.
Fixes#15962.
Fixes#17397.
Fixes#16617.
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