Improve convert to provide message & cause for Throwable

[mohanvive]

Purpose

$subject..

[codecov-io]

Codecov Report

Merging #1463 into master will increase coverage by 0.01%.
The diff coverage is 54.54%.

@@             Coverage Diff              @@
##             master    #1463      +/-   ##
============================================
+ Coverage     67.88%   67.89%   +0.01%     
  Complexity       41       41              
============================================
  Files           643      643              
  Lines         26907    26915       +8     
  Branches       4245     4248       +3     
============================================
+ Hits          18265    18274       +9     
+ Misses         6864     6863       -1     
  Partials       1778     1778

Impacted Files	Coverage Δ	Complexity Δ
...ore/executor/function/ConvertFunctionExecutor.java	57.77% <54.54%> (+1.68%)	0 <0> (ø)	⬇️
...c/main/java/io/siddhi/core/util/ThreadBarrier.java	100% <0%> (+20%)	0% <0%> (ø)	⬇️

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