Adjustments of loader-v4 (part 2)

[Lichtso]

Problem

Continuation of #2630.

Summary of Changes

• Splits TransferAuthority and Finalize into two instructions.
• Adds next-version-forwarding to finalized programs.
• Makes loader-v4 a program runtime v1 loader.

[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.

[pgarg66]

Some nits. Otherwise looks good.