Contact findById activity aggregates

[epipav]

Changes proposed ✍️

What

🤖 Generated by Copilot at 15d7261

This pull request enhances the MemberRepository class with a new interface and method for aggregating member activities. It also improves the findById method by using the new aggregation feature. These changes support the backend logic for displaying member profiles and activity feeds.
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🤖 Generated by Copilot at 15d7261

New interface for
MemberRepository
Spring cleaning the code

Why

How

🤖 Generated by Copilot at 15d7261

• Define ActivityAggregates interface to represent member's activity data (link)
• Add getActivityAggregates method to MemberRepository class to query activity aggregates from database using raw SQL (link)
• Refactor findById method of MemberRepository class to use getActivityAggregates method and return output object with matching properties (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.