Cache control directive improvement

[mostafa-rz]

Bugfix and a new feature for the cache control directive:

1. The paginator directive manipulates the AST and adds "data" field. In the cache control logic, this field identifies as an object without any cache TTL, therefore the max-age of the response is set to 0.
2. Based on the Apollo it should be possible to set the cache control on the type-level.

• Added or updated tests
• Documented user facing changes
• Updated CHANGELOG.md

Changes

1. During the paginator AST manipulation, the cache control directive with inheritance is also set for the "data" field.
2. Type-level cache control feature is implemented.

Breaking changes

Nothing

[spawnia]

Please document type-level @cacheControl in https://github.com/nuwave/lighthouse/blob/master/docs/master/performance/caching.md#http-cache-control-header.

[spawnia]

Thank you, released with https://github.com/nuwave/lighthouse/releases/tag/v6.20.0