Retrieve invitations with comprehensive filtering capabilities including date-based filtering.

Key Features:

• Date Filtering: Use openSinceDays and/or openUntilDays to filter invitations by creation date
• Text Search: Filter by email, first name, last name, or business name with partial matching
• Pagination: Built-in pagination with configurable limits and offsets
• Sorting: Sort results by various fields (creation date, name, etc.)

Date Filter Examples:

• openSinceDays=30: Get invitations from the last 30 days (30 days or newer)
• openUntilDays=90: Get invitations older than 90 days
• openSinceDays=20&openUntilDays=25: Get invitations between 20-25 days old (time window)

Combined Filter Examples:

• openSinceDays=30&firstName=John: Recent invitations for users named John
• openUntilDays=180&businessName=Acme: Older invitations for Acme company
• openSinceDays=20&openUntilDays=25&limit=20: Invitations in 20-25 day window with pagination
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