[BE] Implement Project Ideas Listing API

[davorminchorov]

Business Requirements

As a member, I want to be able to see all project ideas so that I can connect with others and build it.

Acceptance Criteria

• There should be an endpoint which will allow members to see a list of proposed ideas for a project
• The list should be searchable by title
• The list should be filterable by status (Open, Closed, Archived, Accepted) and vocation categories
• The list should be sortable by title and status
• The following fields should be listed:
• Title
• Status (Open, Closed, Archived, Accepted)
• Deleted project idea proposals should not be displayed in the list
• There should be an API documentation for the endpoint