Refactor agent-node and test for different event filters

[Sital999]

• Add support for plural form of event-filter like for "output" , in case of failure add "outputs"
• Add support for event filters containing operator despite having multiple properties
  • eg: address have multiple properties and previously only its properties were used for filter. Now it is also added as filter along with all filter containing operators.
• Add support for filters having no properties. (fee doesn't have properties so previously it was ignored)
• Test for different filters and note down the drawbacks in transactionSchema

[Sital999]

• Add search option in CustomComboBox
• Add object of "id" and "label" as intial item

[mesudip]

Moved back to In progress

ToDos:

• update the Logical Execution function to suport using fromString and compare functions by default if they are available.
• Update UI to support exists for all of the fields.
• Fix schema @mesudip or @reeshavacharya

[Sital999]

As of now following has been implemented

• Added support for Address and Value comparisions
• Also added Logical execution function to support using fromString or fromAny for conversion and compare for comparision
• Updated UI to support exists operator for top level filter like outputs, inputs
• Added input fields conditionally for event filter parameters where it is hidden for exists operator.
• Agent node was also updated to support above feature

[Sital999]

• Support for failed creation of proposal due to stakeUnregistered also added.
• Fix UI in event parameter input fields to update state on deletion of parameters