refactor: Replace rot90v and delete lineLength

[samestep]

Description

Similar to #1077, this PR deletes the lineLength function (unused and redundant with len), and replaces usages of rot90 and rot90v with the identical ops.rot90.

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings
• I have reviewed any generated changes to the diagrams/ folder

[codecov]

Codecov Report

Merging #1078 (bad64b8) into main (7b9a350) will increase coverage by 0.02%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main    #1078      +/-   ##
==========================================
+ Coverage   64.19%   64.21%   +0.02%     
==========================================
  Files          59       59              
  Lines        7407     7400       -7     
  Branches     1674     1674              
==========================================
- Hits         4755     4752       -3     
+ Misses       2551     2547       -4     
  Partials      101      101              

Impacted Files	Coverage Δ
packages/core/src/contrib/Functions.ts	29.80% <20.00%> (-0.18%)	⬇️

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[cmumatt]

Looks great. Thanks for finding and removing these confusing redundancies!