Idea of record search API

[yamarten]

Bluesky is strongly dependent on appview and relay. If the PDS can search for records in the collection, atproto clients can easily realize more functions without relying on them. Specifically, it is assumed that filtering parameters will be added to listRecords.

For example, if you can search the full text of the record, the Bluesky client will be easier to delete the list. The official client implementation does not use appview, but gets all the listitem collection instead.

It may also help you create a new service easily without appview. Filtering is especially effective for records that have links in the repository, such as the affiliation between the list-listitem.

Is it a heavy burden for PDS to have such a function?