#785 - define JPMS module names

## Summary

The goal of this change is to encourage Gradle to put the framework's Jar files in the module path instead of the classpath. For that, we need to explicitly define the `Automatic-Module-Name` attribute in the `MANIFEST.MF` files in framework's Jar files (source: https://docs.gradle.org/current/userguide/java_library_plugin.html#using_libraries_that_are_not_modules).

The newly added attribute follows this format: `<groupId>.<moduleName>` (e.g. `org.incendo.cloud.core`).

Details about this change can be found here: #785.

## Impact

There is no impact nor on maintainer side nor or consumer one not relying on JPMS.

For the ones already relying on JPMS (e.g. Maven users), they will just have to adapt the references in their `module-info.java` files as follow:

From:
```java
module my.module {
  [...]
  requires cloud.core;
  [...]
}
```

To:
```java
module my.module {
  [...]
  requires org.incendo.cloud.core;
  [...]
}
```

Closes #785

Author: Djaytan

gradle/build-logic/src/main/kotlin/CloudBaseConventions.kt

@@ -2,8 +2,11 @@ import com.diffplug.gradle.spotless.SpotlessExtension
 import net.kyori.indra.IndraExtension
 import org.gradle.api.Plugin
 import org.gradle.api.Project
+import org.gradle.api.tasks.bundling.Jar
+import org.gradle.kotlin.dsl.attributes
 import org.gradle.kotlin.dsl.configure
 import org.gradle.kotlin.dsl.dependencies
+import org.gradle.kotlin.dsl.withType
 import org.incendo.cloudbuildlogic.CloudSpotlessExtension
 
 class CloudBaseConventions : Plugin<Project> {
@@ -43,5 +46,11 @@ class CloudBaseConventions : Plugin<Project> {
 
             "checkstyle"(libs.stylecheck)
         }
+
+        target.tasks.withType(Jar::class).configureEach {
+            manifest {
+                attributes("Automatic-Module-Name" to "%s.%s".format(target.group, target.name.replace('-', '.')))
+            }
+        }
     }
 }