[Enhancement] Improved campaign summaries for get/list requests

[stann1]

• removing the unused vault[] from the response props.
• replacing the getall donations sql query with aggregation query
• changing the summary from array to object with with props

"summary": {
            "reachedAmount": 150,
            "currentAmount": 103,
            "blockedAmount": 0,
            "donors": 3
        }