Change the behavior of in-memory tables to support multiple '@index' annotations

[suhothayan]

Purpose

To uniform the behavior of @index annotation of the table.
For more information refer #1228

Release Notes

The behavior of @index annotation of the in-memory table is modified to accept only one index element per annotation. Through this, to use multiple indexes on the table multiple '@index()' annotations should be defined per each index key.

[codecov-io]

Codecov Report

Merging #1491 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             master    #1491      +/-   ##
============================================
- Coverage     68.14%   68.12%   -0.02%     
  Complexity       42       42              
============================================
  Files           643      643              
  Lines         26968    26981      +13     
  Branches       4257     4260       +3     
============================================
+ Hits          18376    18380       +4     
- Misses         6804     6812       +8     
- Partials       1788     1789       +1

Impacted Files	Coverage Δ	Complexity Δ
...ava/io/siddhi/query/api/util/AnnotationHelper.java	32.5% <0%> (-5.74%)	0 <0> (ø)
...io/siddhi/core/partition/PartitionRuntimeImpl.java	86.63% <100%> (+0.46%)	0 <0> (ø)	⬇️
...va/io/siddhi/core/util/parser/PartitionParser.java	98.41% <100%> (ø)	0 <0> (ø)	⬇️
.../io/siddhi/core/util/parser/EventHolderPasser.java	76.66% <66.66%> (-0.7%)	0 <0> (ø)
...java/io/siddhi/core/stream/input/InputHandler.java	77.41% <0%> (-3.23%)	0% <0%> (ø)
...istence/IncrementalFileSystemPersistenceStore.java	50.96% <0%> (-0.97%)	0% <0%> (ø)

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