Cache and reuse token on client side

[lostk1ng]

Currently, when using 0-RTT we use NoValidationQuicTokenHandler on server side which do no validation to avoid retry packet. Should we support token cache and reuse on client side, so we can do address validation on first Initial packet without retry packet?

With a simple investigation, some works need to be done:

1. quiche C-API should support set token to Initial packet.
2. quiche should support send NEW_TOKEN frame.
3. Implement token cache, and maybe add some expiration on token.

[normanmaurer]

@lostk1ng any update on this one ?

[lostk1ng]

@normanmaurer Not much progress as quiche don't support NEW_TOKEN frame yet. See： cloudflare/quiche#1111