Adding iterator approach for function processing

[ambud]

Adding iterative window function support

Updating method names to make more sense

Adding datapoint memory optimization to reuse objects

Disable tests

Fixing inconsistent range problem and start key issue and bad json generation

Refactoring package name because of reflection conflict

Fixing method names for ingestor

Changing grafana query path for v2

Adding iterator window functions

Adding unit tests for functions

[codecov-io]

Codecov Report

Merging #139 into development will decrease coverage by 3.15%. The diff coverage is 29%.

@@                Coverage Diff                @@
##             development     #139      +/-   ##
=================================================
- Coverage          57.44%   54.29%   -3.16%     
- Complexity          1021     1068      +47     
=================================================
  Files                124      141      +17     
  Lines               6016     6730     +714     
  Branches             709      787      +78     
=================================================
+ Hits                3456     3654     +198     
- Misses              2341     2841     +500     
- Partials             219      235      +16

Impacted Files	Coverage Δ	Complexity Δ
...nder/core/functions/list/SingleSeriesFunction.java	100% <ø> (ø)	4 <0> (?)
...nder/core/functions/list/BasicSingleFunctions.java	56.31% <ø> (ø)	0 <0> (?)
...dewinder/core/functions/list/ConstantFunction.java	0% <ø> (ø)	0 <0> (?)
...ewinder/core/functions/list/TransformFunction.java	66.66% <ø> (ø)	4 <0> (?)
...dewinder/core/functions/list/WindowedFunction.java	84% <ø> (ø)	7 <0> (?)
...com/srotya/sidewinder/core/analytics/Nd4jTest.java	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
.../sidewinder/core/functions/list/FunctionTable.java	83.87% <ø> (ø)	8 <0> (?)
.../sidewinder/core/functions/list/ChainFunction.java	91.66% <ø> (ø)	5 <0> (?)
...r/core/functions/list/BasicTransformFunctions.java	35% <ø> (ø)	0 <0> (?)
...er/core/functions/list/BasicConstantFunctions.java	0% <ø> (ø)	0 <0> (?)
... and 60 more

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