Remove all unnecessary data from response bodies of public endpoints, add mandatory paging

[stann1]

Including, but not limited to:

• Campaign details on cmapaign list/get
• Donation details on donation list
• ...

Mandatory paging should be introduced to all public endpoints of campaigns, donations, etc...

[carolinepetrova]

I volunteer to take this ticket.

[PereiraSwain]

Hey ! I would like to take this issue up but can you help me in understanding it as I am a beginner.