refact(callActivity): restructure code of CallActivityBehavior

related to CAM-3185
fix(null-check): add a null-check

related to CAM-3189
refact(jobRetries/cmd): restructure code of FoxJobRetryCmd

related to CAM-3235
chore(engine/scripting): provide script engine to env
Initial support of IBM Informix database.
Create / drop function enabled.