Adding map reader writer for batch and realtime. Supports map<int,int…

[kishoreg]

…> for now

[codecov-io]

Codecov Report

Merging #11 into develop will decrease coverage by 0.1%. The diff coverage is 45%.

@@              Coverage Diff              @@
##             develop      #11      +/-   ##
=============================================
- Coverage      67.13%   67.03%   -0.11%     
  Complexity         4        4              
=============================================
  Files           1030     1036       +6     
  Lines          50780    50960     +180     
  Branches        7100     7115      +15     
=============================================
+ Hits           34092    34161      +69     
- Misses         14364    14465     +101     
- Partials        2324     2334      +10

Impacted Files	Coverage Δ	Complexity Δ
...re/io/writer/impl/v1/BaseMapSingleValueWriter.java	14.28% <14.28%> (ø)	0 <0> (?)
...o/readerwriter/BaseMapSingleValueReaderWriter.java	3.22% <3.22%> (ø)	0 <0> (?)
...pinot/core/io/reader/BaseMapSingleValueReader.java	4% <4%> (ø)	0 <0> (?)
...iter/impl/FixedByteMapSingleValueReaderWriter.java	59.09% <59.09%> (ø)	0 <0> (?)
...o/reader/impl/v1/FixedBitMapSingleValueReader.java	61.53% <61.53%> (ø)	0 <0> (?)
...o/writer/impl/v1/FixedBitMapSingleValueWriter.java	82.35% <82.35%> (ø)	0 <0> (?)
...egation/function/customobject/MinMaxRangePair.java	75.86% <0%> (-24.14%)	0% <0%> (ø)
...impl/dictionary/DoubleOnHeapMutableDictionary.java	68.88% <0%> (-13.34%)	0% <0%> (ø)
...elix/core/periodictask/ControllerPeriodicTask.java	76.31% <0%> (-7.9%)	0% <0%> (ø)
.../impl/dictionary/FloatOnHeapMutableDictionary.java	86.66% <0%> (-6.67%)	0% <0%> (ø)
... and 26 more

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[xiangfu0]

lgtm