Extension API 1.6 (#2120)

* Non-Extension Index changes for 1.6

* Changelog

* Minor fixes

* Implement extension store

* Test build fix

* Docs

* Simplify fetching manga and chapters

* Use EMPTY JsonObject

* Update docs/Configuring-Suwayomi‐Server.md

Co-authored-by: Constantin Piber <59023762+cpiber@users.noreply.github.com>

* Improve Fetch Extension Store

* Fixes

* Simplify deprecated isNsfw in SourceQuery

* Simplify ContentRating in Source.kt

* Simplify isNsfw in SourceType

* No magic numbers for ContentRating, improves safety for future versions of extension api

* Fix SearchTest

* Lint

* Lint

* Optimize imports and fix unchecked cast warning

* Proper extension store queries

* Optimize import fixes

* Add ContentRatingFilter

* Improve extension store sync

* fix: re-sync (#2121)

* Lint

* Add ExtenionStores to the fetchExtensions result since its possible for the stores to change.

* Use a single version of ContentRating

* Exclude ServerConfig.extensionStores from GraphQL

* Use syncDbToPrefs in ExtensionStoreMutation

* Optimize Imports

* Update server/server-config/src/main/kotlin/suwayomi/tachidesk/server/ServerConfig.kt

Co-authored-by: Constantin Piber <59023762+cpiber@users.noreply.github.com>

* Remove replaceWith and add specific description for GQL APIs

* Include OkHttp ZSTD

* Update to latest Mihon extension lib

* Fix latest Mihon Extension Lib

* Lint

* Optimize imports

* Lint

* Review fixes

* Add a index to extesnion table store url

* Lint

---------

Co-authored-by: Constantin Piber <59023762+cpiber@users.noreply.github.com>

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Added
 - (**Sync**) Added [SyncYomi](https://github.com/syncyomi/syncyomi) support
 - (**OPDS**) Add option to skip chapter metadata feed providing direct stream/download links
+- (**Extension/API**) Support Extensions API v1.6
 
 ### Changed
 - (**Database/H2**) Use the latest H2 database engine