[Improvement] Improve enrich mediator to accept arguments/Xpath

[sajinieKavindya]

Description

Description :
Improve enrich mediator to accept arguments/Xpath

eg:

<enrich>
<source type="inline" clone="true">
<agentAddress>
<line1>${//agentStreetAddressLine1}</line1>
<line1>${//agentStreetAddressLine2}/line1>
<line1>${//agentStreetAddressLine3}</line1>
</agentAddress>
</source>
<target type="property" property="agentAddress"/>
</enrich>

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