Add a basic infrastructure for configurations.

[ueshin]

No description provided.

[softagram-bot]

Softagram Impact Report for pull/645 (head commit: 760fa72)

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[codecov-io]

Codecov Report

Merging #645 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #645      +/-   ##
==========================================
+ Coverage   92.97%   93.01%   +0.03%     
==========================================
  Files          31       32       +1     
  Lines        5085     5109      +24     
==========================================
+ Hits         4728     4752      +24     
  Misses        357      357

Impacted Files	Coverage Δ
databricks/koalas/usage_logging/__init__.py	97.22% <100%> (ø)	⬆️
databricks/koalas/__init__.py	84.61% <100%> (+0.4%)	⬆️
databricks/koalas/config.py	100% <100%> (ø)

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[ueshin]

Let me merge this now.