HHH-10883 - Fix Restore the Maven artifact hibernate-java8 as an empty placeholder

hibernate-java8/hibernate-java8.gradle

@@ -0,0 +1,24 @@
+dependencies {
+    compile( project( ':hibernate-core' ) )
+}
+
+mavenPom {
+    name = '(deprecated - use hibernate-core instead) Java8-specific Hibernate O/RM functionality'
+    description = '(deprecated - use hibernate-core instead) Support for Java8-specific features - mainly Java8 Date/Time (JSR 310)'
+}
+
+public String osgiDescription() {
+    return mavenPom.description
+}
+
+jar {
+    // The OSGi JAR manifest support does not like a non-existent classes dir,
+    // so make sure we dont use the OSGi one :)
+    manifest = null
+}
+
+sourcesJar {
+    // The OSGi JAR manifest support does not like a non-existent classes dir,
+    // so make sure we dont use the OSGi one :)
+    manifest = null
+}

hibernate-java8/src/main/resources/README.txt

@@ -0,0 +1,3 @@
+Java8-specific Hibernate O/RM functionality has been merged into the hibernate-core module, making this hibernate-java8 module
+obsolete.  This module will be removed in Hibernate ORM 6.0.  It is only kept here for various consumers that expect a
+static set of artifact names across a number of Hibernate releases. See https://hibernate.atlassian.net/browse/HHH-10883

settings.gradle

@@ -14,6 +14,8 @@ include 'hibernate-testing'
 include 'hibernate-envers'
 include 'hibernate-spatial'
 
+include 'hibernate-java8'
+
 include 'hibernate-osgi'
 
 include 'hibernate-c3p0'