ENH: New accessor change_axis_type

[Zeroto521]

• closes #xxxx
• whatsnew entry

    >>> df = pd.DataFrame([[1, 2], [3, 4]])
    >>> df
       0  1
    0  1  2
    1  3  4
    >>> df.index
    RangeIndex(start=0, stop=2, step=1)
    >>> df.change_axis_type(str).index
    Index(['0', '1'], dtype='object')

[codecov]

Codecov Report

Merging #768 (4d7305c) into main (0ab1c19) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #768   +/-   ##
=======================================
  Coverage   99.60%   99.61%           
=======================================
  Files         111      113    +2     
  Lines        1526     1550   +24     
  Branches      346      353    +7     
=======================================
+ Hits         1520     1544   +24     
  Misses          1        1           
  Partials        5        5           

Impacted Files	Coverage Δ
dtoolkit/accessor/dataframe/change_axis_type.py	100.00% <100.00%> (ø)
dtoolkit/accessor/series/change_axis_type.py	100.00% <100.00%> (ø)

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