ENH: Add plotting.sample_ratio in config

[charlesdong1991]

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Softagram Impact Report for pull/737 (head commit: d387802)

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Codecov Report

Merging #737 into master will decrease coverage by 2.38%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #737      +/-   ##
==========================================
- Coverage    94.4%   92.01%   -2.39%     
==========================================
  Files          32       32              
  Lines        5580     5588       +8     
==========================================
- Hits         5268     5142     -126     
- Misses        312      446     +134

Impacted Files	Coverage Δ
databricks/koalas/plot.py	93.88% <100%> (-1.03%)	⬇️
databricks/koalas/config.py	100% <100%> (ø)	⬆️
databricks/koalas/usage_logging/__init__.py	23.14% <0%> (-74.08%)	⬇️
databricks/koalas/usage_logging/usage_logger.py	50% <0%> (-50%)	⬇️
databricks/koalas/__init__.py	77.5% <0%> (-7.5%)	⬇️
databricks/conftest.py	90.69% <0%> (-6.98%)	⬇️
databricks/koalas/frame.py	93.4% <0%> (-1.73%)	⬇️
databricks/koalas/namespace.py	92.15% <0%> (-1.57%)	⬇️
databricks/koalas/utils.py	97.24% <0%> (-0.69%)	⬇️
... and 3 more

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[HyukjinKwon]

We might need a way to check the value set in its options at #738 .. hm .. let me think about this a bit more.

[charlesdong1991]

hmm, how about checking the value here? so if fraction is given a number larger than 1, the raise an error/warning message? feel like checking the value as well in options sounds a bit overkill

[HyukjinKwon]

Actually there are some other cases where we need to check values like default index type .. I tried to integrate convert / check logics at #739 to make it less overkill. Please take a look when you are available.

And technically we can set upper/lower bounds for other cases too (e.g., only positive numbers).

[HyukjinKwon]

Let me just merge and make a followup.

Thanks for working on this @charlesdong1991