Retrieve a paginated list of registrations for a webinar. Returns contact
information, attendance status, engagement metrics, and attribution data
for each registrant.

Pagination uses cursor-based pagination with a page_info object in the
response rather than per-record cursors. Use page_info.end_cursor as
the cursor parameter to fetch the next page.

Requires api token with one of the following permissions

Read all data

Tokens with the "Act with a team member's permissions" permission
(all:delegate_to_contact_permissions scope) can also be used. Requests
made with such a token are authorized using the permissions of the
contact assigned to the token.

An expiring access token
created with the all:delegate_to_contact_permissions scope and an
authorization naming this webinar (any permission) can also be used; it
lists the webinar's registrations.