Retrieve a list of campaigns with optional filtering, sorting, and pagination. Supports JSON:API specification with includes, filtering, sorting, and pagination.

Query Options:

• 📦 Include Related Data - include=leads to include associated leads
• 🔍 Filter Results - filter[status]=active or filter[updated_at][gte]=2024-01-01
• ↕️ Sort - sort=-inserted_at (newest first) or sort=name
• 📄 Paginate - page[limit]=25&page[offset]=50&page[count]=true
• ✂️ Select Fields - fields[campaigns]=name,status,lead_count

Combine multiple parameters with &. Example:
?filter[status]=active&include=leads&sort=-inserted_at&page[limit]=10