[build] apply nexus-publish plugin on ALL projects (ExpediaGroup#567)

It appears that maven-publish plugin will skip its execution if repositories are not configured in given project. Changing the configuration to apply nexus-publish plugin on all projects.

[build] explicitly configure nexus-publish-plugin on root project (Ex…

…pediaGroup#563)

Gradle `publish` task now explicitly depends on the `initializeSonatypeStagingRepository` task from `nexus-publish-plugin`. We need to explicitly set this as we are not publishing any artifacts from the root project.

[build] configure GH action PR check for documentation updates (Exped…

…iaGroup#549)

* [build] configure GH action PR check for documentation updates

Github Action checks out the repository and attempts to run [docusaurus-build](https://docusaurus.io/docs/en/commands#docusaurus-build) command.

* limit PR check to just docs and website directories

Delete publish package GH Action (ExpediaGroup#482)

Disable the GH action for now to publish to GH Package Registry

Validate subscription return type (ExpediaGroup#476)

Subscriptions must return a org.reactivestreams.Publisher for graphql-java to work properly. An exception will now be thrown if any return type of a top level subscription is not a subclass of Publisher

Fixes ExpediaGroup#359

build: 1.3.1-SNAPSHOT (Travis Build 1294) (ExpediaGroup#461)

[docs] spring-server documentation updates (ExpediaGroup#456)

Update siteConfig.js

[chore] force Github CI Action to use default maven build profile (Ex…

…pediaGroup#441)

[spring-server] simplify schema configuration auto configuration (Exp…

…ediaGroup#433)

`SchemaGeneratorConfig`/`FederatedSchemaGeneratorConfig` auto config beans now accept optional parameters to set custom hooks, data fetcher factory provider and top level names.