Retrieves program request summary with advanced filtering options

Fetches request summary with extensive filter options. Returns all matching results by default. Use 'page' and 'size' parameters for paginated results.

Filter Options:

• Filter by program ID or import type
• Search by description keyword
• Filter by submitting user, request ID, or date range
• Limit results by maximum request ID
• Optionally include child requests

Import Type Shortcuts:

• orders: Automatically resolves to the ORDERHUB program
• indexImport: Searches by description 'Import Indexes Processor'
• Any other value: Resolved as a program short name

Sort: Defaults to description:ASC when not specified.