Feature - UpgradeableLoaderInstruction::ExtendProgramChecked

[Lichtso]

See SIMD-0164.

Feature Gate Issue: TODO

[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.

[joncinque]

Just a fly-by review, the program logic looks great to me, just some small comments on the CLI and tests

[joncinque]

Just a couple of last things, and thanks for fixing up the tests, they look great!

[joncinque]

Just the last bit from my side, then this is ready to go in!

[joncinque]

Looks like there's just some lockfile changes to commit, then this is good to go!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.07287% with 232 lines in your changes missing coverage. Please review.

Project coverage is 82.8%. Comparing base (0142ceb) to head (f64f03c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6131     +/-   ##
=========================================
- Coverage    82.9%    82.8%   -0.1%     
=========================================
  Files         842      842             
  Lines      377680   377777     +97     
=========================================
- Hits       313154   313142     -12     
- Misses      64526    64635    +109     

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[joncinque]

Looks great to me, thanks for addressing all the points!