Tooling changes for recent WUM updates

[GDLMadushanka]

Description:
Recently we shipped several improvements for JSON, Jager, Tasks as WUM updates in EI 6.6.0.
For those new functionalities to work we need to add the following changes to the tooling.

• Property mediator trace scope
• New property called "invokeHandlers" in tasks
• New "remove" action for enrich mediator
• New "aggregateElementType" property for Aggregate mediator
• New "JSON" data type for property mediator

1. Property Mediator
   Currently, in EI Jager tracing, we can only see the property name. We should improve the code to add the property value also.

Here if the property mediator scope is given as trace

<property name="CHARACTER_SET_ENCODING" value="ISO-8859-1" scope="trace" type="STRING"/>

The Trace scope should be added to Property mediator

"JSON" data type is introduced to the property mediator
Sample
<property name="Greeting" expression="json-eval($.)" type="JSON"/>

2. Tasks
   In scheduled Tasks, we are introducing a new additional property called "invokeHandlers"
   This property can have either "true" | "false"
   This property is applicable only if injectTo == "seq" | "main" (not for proxy)

3. Enrich mediator
   Example

<enrich>
    <source clone="true" xpath="json-eval($.store.book[*].author,$.store.book[0])"/>
    <target type="body" action="remove"/>
</enrich>

UI validation: When target action = "remove" source type should be custom only.

4. Aggregate mediator
   Add aggregateElementType to onComplete section
   This property can have only 2 values "root" | "child"

Suggested Labels:
improvement

Affected Product Version:
EI 6.6.0

Related Issues:
wso2/product-ei#5218
wso2/product-ei#5199
wso2/product-ei#5226
wso2/product-ei#5266