Persisted Query Support and REST Mapping Layer added

The Headless Server now supports Persisted Queries (including Automated Persisted Queries) and query whitelisting.

All persisted queries may be called alternatively via an automatically deployed REST endpoint for each persisted query. The response of the REST endpoints can optionally be transformed using JSLT.

To protect the headless server against malicious attacks or costly queries, the queries on the graphql endpoint may be monitored by a configurable timeout and query metrics like query depth, query complexity and a search limit.

(CMS-15851)

Add Server side 360° picture spinner support

Add spinner interface and type to the Graphql Schema.

(CMS-13586)