Add support to remove stream and query callback dynamically.

[suhothayan]

Purpose

Fixes #1590

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@43b2db4). Click here to learn what that means.
The diff coverage is 76.66%.

@@            Coverage Diff            @@
##             master    #1594   +/-   ##
=========================================
  Coverage          ?   67.74%           
  Complexity        ?       45           
=========================================
  Files             ?      651           
  Lines             ?    27522           
  Branches          ?     4339           
=========================================
  Hits              ?    18644           
  Misses            ?     7061           
  Partials          ?     1817

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/io/siddhi/core/stream/StreamJunction.java	68.28% <100%> (ø)	0 <0> (?)
...in/java/io/siddhi/core/query/QueryRuntimeImpl.java	91.8% <100%> (ø)	0 <0> (?)
...ddhi/core/query/output/callback/QueryCallback.java	100% <100%> (ø)	0 <0> (?)
...main/java/io/siddhi/core/SiddhiAppRuntimeImpl.java	63% <60%> (ø)	0 <0> (?)
...core/query/output/ratelimit/OutputRateLimiter.java	91.93% <83.33%> (ø)	0 <0> (?)

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