o1vm/riscv32i: split interpret_instruction in subroutines

[dannywillems]

Leaving the implementation details for @svv232

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 72.08%. Comparing base (692acab) to head (9c481e9).

Files with missing lines	Patch %	Lines
o1vm/src/interpreters/riscv32i/interpreter.rs	0.00%	20 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                            @@
##           dw/interpreter-constraint-witness-env    #2748      +/-   ##
=========================================================================
- Coverage                                  72.11%   72.08%   -0.03%     
=========================================================================
  Files                                        255      255              
  Lines                                      59072    59090      +18     
=========================================================================
- Hits                                       42598    42595       -3     
- Misses                                     16474    16495      +21     

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