Add Vote program AuthorizeWithSeed instruction

[CriesofCarrots]

Problem

It's possible to set an authorized voter or withdrawer to a derived key. Even though you can prove control of the base key, it's currently not possible to use that proof to authorize a new authority.

Proposed Solution

Add VoteInstruction::AuthorizeWithSeed to the vote program, and plumb client support
The instruction processor will need to be feature-gated, since it will cause transactions with the new instruction data to succeed, where they currently fail.