refactor(core): migrate to standard Java ServiceLoader for plugins

Changes:
- add new top level interface `Plugin`
- add new `JsonDeserializer` aware of the `PluginRegistry`
- add new annotation processor for plugin
- migrate to hibernate-validator for the JSR-303 (no bean introspection dependencies)
- update all Validation annotations to be complitant with the JSR-303
- remove all KestraApplicationContext stuffs
- fix some tests

part-of: kestra-io/plugin-template-test#25
part-of: kestra-io/plugin-serdes#103

runner-memory/src/main/java/io/kestra/runner/memory/MemoryExecutor.java

@@ -17,7 +17,6 @@ import io.kestra.core.services.*;
 import io.kestra.core.tasks.flows.ForEachItem;
 import io.kestra.core.tasks.flows.Template;
 import io.kestra.core.utils.Either;
-import io.micronaut.context.ApplicationContext;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
 import jakarta.inject.Singleton;

runner-memory/src/test/resources/application-test.yml

@@ -7,6 +7,6 @@ kestra:
     type: local
     local:
       base-path: /tmp/unittest
-  worker:
+  server:
     liveness:
       enabled: false