Add is_boolean, is_categorical, is_floating, is_integer, is_interval, is_numeric and is_object in Index and MultiIndex

[HyukjinKwon]

See https://pandas.pydata.org/pandas-docs/stable/reference/indexing.html#

[softagram-bot]

Softagram Impact Report for pull/795 (head commit: 10bc39d)

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[codecov-io]

Codecov Report

Merging #795 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #795   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files          32       32           
  Lines        5770     5770           
=======================================
  Hits         5440     5440           
  Misses        330      330

Impacted Files	Coverage Δ
databricks/koalas/missing/indexes.py	100% <ø> (ø)	⬆️
databricks/koalas/indexes.py	99.22% <100%> (+0.09%)	⬆️

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[ueshin]

LGTM.

[ueshin]

Thanks! merging.