o1vm: implement a simple ELF loader

[dannywillems]

This is only a first draft. In future PR, FIXME will be implemented.
It is mostly to start moving commits from the pull request #2727

[codecov]

Codecov Report

Attention: Patch coverage is 91.73554% with 10 lines in your changes missing coverage. Please review.

Project coverage is 73.71%. Comparing base (fd0e8b8) to head (9130939).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
o1vm/src/elf_loader.rs	91.73%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2741      +/-   ##
==========================================
+ Coverage   73.67%   73.71%   +0.03%     
==========================================
  Files         248      249       +1     
  Lines       57745    57866     +121     
==========================================
+ Hits        42542    42654     +112     
- Misses      15203    15212       +9     

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[dannywillems]

The stack pointer must be set to a different address. The loader decides where to locate the first address. With @svv232 we think about having two continuous array, one for the heap, and one for the stack. It would be a follow-up of #2042.

[dannywillems]

I'm taking the responsibility to improve it in the near future.