Revisit frequently used mediator pages

[chanikag]

Description

This task is to improve following mediator pages

• 1. Iterate Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/iterate-mediator
• 2. Aggregate Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/aggregate-mediator
• 3. Foreach Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/foreach-mediator
• 4. Clone Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/clone-mediator

Describe the problem(s)

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Describe your solution(s)

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[chanikag]

Please check #923 too

[chanikag]

Guide: https://docs.google.com/document/d/1_9Ca2Kilrw-a73TBKt5MdEt4EkrCswCBoF9aFXfQRis/edit

[chanikag]

Foreach Mediator #1051