Parameterise Column

[mrmr1993]

This PR adds a parameter to Column, letting us use saner types in place of usize where appropriate. This PR is a no-op, retaining the use of usize everywhere for now.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.61%. Comparing base (2136d6c) to head (21c8196).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
ivc/src/expr_eval.rs	0.00%	4 Missing ⚠️
ivc/src/plonkish_lang.rs	0.00%	1 Missing ⚠️
ivc/src/prover.rs	0.00%	1 Missing ⚠️
ivc/src/verifier.rs	0.00%	1 Missing ⚠️
msm/src/expr.rs	75.00%	1 Missing ⚠️
o1vm/src/interpreters/keccak/column.rs	50.00%	1 Missing ⚠️
o1vm/src/interpreters/mips/column.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2948   +/-   ##
=======================================
  Coverage   76.61%   76.61%           
=======================================
  Files         255      255           
  Lines       60855    60855           
=======================================
+ Hits        46622    46626    +4     
+ Misses      14233    14229    -4     

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