Revisit frequently used mediator pages

[chanikag]

Description

This task is to improve the mediator pages of

• 1. Call Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/call-mediator
• 2. Respond Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/respond-mediator
• 3. Filter Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/filter-mediator
• 4. Switch Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/switch-mediator
• 5. Class mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/class-mediator

Describe the problem(s)

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[chanikag]

Respond mediator refactored via #979

[chanikag]

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