gen-state-json

[martyall]

This PR is meant to test #2906 and also the elf_loader module. Additionally, we generalize the elf_loader to work with both riscv and mips

Changes

• generalize elf_loader to work with mips/ simplify some indices during memory-page construction.
• remove the generated dir o1vm/resources/programs/mips/bin and add to gitignore
• add a test script o1vm/test-gen-state-json.sh which tests the elf loader / state.json generator over all of the example mips programs.
• added a MIPS Build and Package github workflow that runs on dispatch trigger. This workflow:
  1. builds the mips tools
  2. runs make build-mips-programs to build all of the example mips program binaries.
  3. checks that our elf loader can parse these programs
  4. uploads a tar file and provides a URL for downloads (intended for devs who don't have the tools to build them locally)
• makes meta.json file optional in pickles_o1vm cli. This simple change is not needed for the above -- it was picked over by mistake. Still, the change is trivial and needed for later work so I'm hoping we can keep it.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 46 lines in your changes missing coverage. Please review.

Project coverage is 73.44%. Comparing base (2637499) to head (84c1103).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
o1vm/src/legacy/main.rs	0.00%	16 Missing ⚠️
o1vm/src/pickles/main.rs	0.00%	16 Missing ⚠️
o1vm/src/elf_loader.rs	79.31%	6 Missing ⚠️
o1vm/src/interpreters/mips/witness.rs	0.00%	5 Missing ⚠️
o1vm/src/cli/cannon.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2911      +/-   ##
==========================================
- Coverage   73.45%   73.44%   -0.02%     
==========================================
  Files         259      259              
  Lines       61593    61618      +25     
==========================================
+ Hits        45243    45253      +10     
- Misses      16350    16365      +15     

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