Detect moved items in ordered iterables

[akshat62]

Summary

• detect reverse difflib replacements as item moves
• test that list swaps report iterable_item_moved
• document iterable_item_moved usage

[codecov[bot]]

Codecov Report

:x: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 96.08%. Comparing base (b639fec) to head (9f11980).

Files with missing lines	Patch %	Lines
deepdiff/diff.py	96.66%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #563   +/-   ##
=======================================
  Coverage   96.07%   96.08%           
=======================================
  Files          16       16           
  Lines        4463     4490   +27     
=======================================
+ Hits         4288     4314   +26     
- Misses        175      176    +1     

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