WPS349 highlighting

[MIXgleb]

I have made things!

• Improves WPS349 RedundantSubscriptViolation highlighting: now a specific slice index is highlighted, not the entire slice;

if not lower_ok:
    self.add_violation(
        consistency.RedundantSubscriptViolation(node.slice.lower)
    )

if not upper_ok:
    self.add_violation(
        consistency.RedundantSubscriptViolation(node.slice.upper)
    )

if not step_ok:
    self.add_violation(
        consistency.RedundantSubscriptViolation(node.slice.step)
    )

instead of

if not (lower_ok and upper_ok and step_ok):
    self.add_violation(
        consistency.RedundantSubscriptViolation(node)
    )

I find it more appropriate to specify which index contains the redundant grammar

Checklist

• I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
• I have created at least one test case for the changes I have made
• I have updated the documentation for the changes I have made
• I have added my changes to the CHANGELOG.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7b83f78) to head (20243a8).
⚠️ Report is 65 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3437   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          362       362           
  Lines        11968     11987   +19     
  Branches       818       821    +3     
=========================================
+ Hits         11968     11987   +19     

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[sobolevn]

On the other hand - why not? It is better to the user to see what index is wrong exactly. Please, add a test with 2 and 3 wrong indexes.

[MIXgleb]

that's exactly what my idea was to improve visibility))

Extra tests have been added.

[sobolevn]

Thanks!