Introduce RESET processing mode to preserve memory optimization.

[suhothayan]

Purpose

Fixes #1440
Not compromise memory optimization.

[codecov-io]

Codecov Report

Merging #1444 into master will increase coverage by 0.01%.
The diff coverage is 55.55%.

@@             Coverage Diff              @@
##             master    #1444      +/-   ##
============================================
+ Coverage     67.74%   67.76%   +0.01%     
  Complexity       41       41              
============================================
  Files           634      634              
  Lines         26785    26792       +7     
  Branches       4231     4232       +1     
============================================
+ Hits          18146    18155       +9     
+ Misses         6870     6868       -2     
  Partials       1769     1769

Impacted Files	Coverage Δ	Complexity Δ
...cessor/stream/window/TimeBatchWindowProcessor.java	76.43% <100%> (ø)	0 <0> (ø)	⬇️
...io/siddhi/core/query/processor/ProcessingMode.java	51.72% <50%> (-2.83%)	0 <0> (ø)
...ore/util/snapshot/state/SingleSyncStateHolder.java	91.66% <0%> (-2.78%)	0% <0%> (ø)
...java/io/siddhi/core/stream/input/InputHandler.java	80.64% <0%> (+3.22%)	0% <0%> (ø)	⬇️
.../siddhi/core/util/event/handler/StreamHandler.java	74% <0%> (+12%)	0% <0%> (ø)	⬇️

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