use solana-instruction instead of solana-sdk in solana-stake-program

[kevinheavey]

Same idea as #4327

This program uses the one-line utility function checked_add which is in solana-program but not in solana-instruction. I just copied it to this crate as was already done with the system program and address lookup table program

[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]

LGTM