Fast bounds-check for infinite CartesianIndex StepRangeLen

[jishnub]

Julia v1.11 allows StepRangeLen{<:CartesianIndex} indices, but the bounds-check for such a range falls back to element-wise iteration. The other issue with such an infinite range is that last can't be defined as a CartesianIndex, as it only accepts Ints.
In this PR, we define checkindex for such indices by only comparing the starting point. This would allow bounds-checking for infinite arrays with such indices.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.14%. Comparing base (8865985) to head (7ee603a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   85.49%   86.14%   +0.65%     
==========================================
  Files           7        6       -1     
  Lines         772      758      -14     
==========================================
- Hits          660      653       -7     
+ Misses        112      105       -7     

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