bors[bot] ef00b5af1c Merge #1312
1312: Introduce TokenBuffer r=matklad a=edwin0cheng

As discussed in Zulip, this PR Introduce `TokenBuffer` , a safe version of  `syn` crate `TokenBuffer` which support cursor based traversal of `tt::TokenTree`. This is the basis of incoming refactoring of `TokenSource` iterator based API.

This PR do the following things:

* Add TokenBuffer in `ra_tt` crate.
* Try to use this new API to refactor the `SubtreeSource` to prove it usage.




Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>
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