init new state layout

[buffalojoec]

Problem

All of the non-deprecated state types from the original Vote program need to be
added to the BPF version. This presents a great opportunity for organizing all
of those types a little better, especially because they will live in one crate
now!

Summary of Changes

Copy over a large chunk (not all) of the Vote program's state types into the new
BPF crate and introduce a more organized module structure.

Note: Most of the rest of the state types require changes from 2.0, pertaining
to Stake deserialization.

[buffalojoec]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• process update commission #10
• process update validator identity #9
• process authorize #8
• process initialize account #7
• init processor #5
• state: add vote_state #11
• init instructions #4
• init new state layout #3 👈 (View in Graphite)
• init errors #2
• add frozen abi requirements #1
• temp: pin versions to 2.0 from repo #6
• main

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