EHN: New Index method to_set

[Zeroto521]

• closes #xxxx
• whatsnew entry

Similar to Series.to_set, but for Index.

[codecov]

Codecov Report

Merging #529 (f17ec4f) into main (b57b999) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #529   +/-   ##
=======================================
  Coverage   99.64%   99.65%           
=======================================
  Files          61       63    +2     
  Lines         853      860    +7     
  Branches      101      101           
=======================================
+ Hits          850      857    +7     
  Misses          1        1           
  Partials        2        2           

Impacted Files	Coverage Δ
dtoolkit/accessor/__init__.py	100.00% <100.00%> (ø)
dtoolkit/accessor/index/__init__.py	100.00% <100.00%> (ø)
dtoolkit/accessor/index/to_set.py	100.00% <100.00%> (ø)

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