Fix Serialization issue as well as min/max bound for uniform sampling

[idreeskhan]

Fixes #127 #128

[codecov]

Codecov Report

Merging #129 into master will decrease coverage by 31.23%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #129       +/-   ##
==========================================
- Coverage   71.33%   40.1%   -31.24%     
==========================================
  Files          29      29               
  Lines        1392    1394        +2     
  Branches      163     163               
==========================================
- Hits          993     559      -434     
- Misses        399     835      +436

Flag	Coverage Δ
#ratatoolCli	4.44% <0%> (-0.01%)	⬇️
#ratatoolCommon	100% <ø> (ø)	⬆️
#ratatoolDiffy	26.99% <0%> (-0.05%)	⬇️
#ratatoolExamples	19.35% <0%> (-0.04%)	⬇️
#ratatoolSampling	?
#ratatoolScalacheck	82.11% <ø> (ø)	⬆️
#ratatoolShapeless	5.37% <0%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
...pling/src/main/scala/com/spotify/scio/Random.scala	0% <0%> (-77.42%)	⬇️
...ol/samplers/util/SamplerSCollectionFunctions.scala	0% <0%> (-91.84%)	⬇️
...ala/com/spotify/ratatool/samplers/BigSampler.scala	0% <0%> (-59.43%)	⬇️
...la/com/spotify/ratatool/samplers/AvroSampler.scala	0% <0%> (-96.88%)	⬇️
...main/scala/com/spotify/ratatool/io/ParquetIO.scala	0% <0%> (-96.16%)	⬇️
.../scala/com/spotify/ratatool/samplers/Sampler.scala	0% <0%> (-90%)	⬇️
...cala/com/spotify/ratatool/samplers/util/Util.scala	0% <0%> (-90%)	⬇️
...rc/main/scala/com/spotify/ratatool/io/AvroIO.scala	0% <0%> (-82.06%)	⬇️
...scala/com/spotify/ratatool/io/TableRowJsonIO.scala	0% <0%> (-76.93%)	⬇️
... and 3 more

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[catherinejelder]

looks good