remove solana-sdk from loader-v4-program

[kevinheavey]

Problem

This crate no longer needs all of solana-sdk

Summary of Changes

Replace with component crates

[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.