remove almost all solana-sdk usage from solana-stake-program

[kevinheavey]

Problem

All solana-sdk usage can be removed from solana-stake-program, except for the genesis_config module, which is getting pulled out in #4076

Summary of Changes

Remove what can be removed

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[tao-stones]

otherwise look good, just one question for clarification.

[tao-stones]

lgtm