Parameterize BandSlice to accept arbitrary ranges

[jishnub]

On Julia v1.11, diagind may return a range of CartesianIndexes. This prepares BandSlice to accept such ranges.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e445b49) 89.55% compared to head (4ee79e9) 89.55%. Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #415 +/- ## ======================================= Coverage 89.55% 89.55% ======================================= Files 25 25 Lines 3542 3544 +2 ======================================= + Hits 3172 3174 +2 Misses 370 370 ```

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