Deprecate modules of the empty artifacts to discourage their usage

#KT-51907

libraries/stdlib/jdk7/build.gradle

@@ -49,6 +49,10 @@ jar {
     from sourceSets.java9.output
 }
 
+sourcesJar {
+    from sourceSets.java9.allSource
+}
+
 
 artifacts {
     archives sourcesJar

libraries/stdlib/jdk7/java9/module-info.java

@@ -1,4 +1,8 @@
+/**
+ * @deprecated This module is empty and therefore deprecated, please use <code>kotlin.stdlib</code> instead.
+ */
 @SuppressWarnings("module") // suppress warnings about terminal digit and exporting packages to not-yet-built kotlin-stdlib-jdk8
+@Deprecated
 module kotlin.stdlib.jdk7 {
     requires transitive kotlin.stdlib;
 }

libraries/stdlib/jdk8/build.gradle

@@ -53,6 +53,9 @@ jar {
     from sourceSets.java9.output
 }
 
+sourcesJar {
+    from sourceSets.java9.allSource
+}
 
 artifacts {
     archives sourcesJar

libraries/stdlib/jdk8/java9/module-info.java

@@ -1,4 +1,8 @@
+/**
+ * @deprecated This module is empty and therefore deprecated, please use <code>kotlin.stdlib</code> instead.
+ */
 @SuppressWarnings("module") // suppress warning about terminal digit
+@Deprecated
 module kotlin.stdlib.jdk8 {
     requires transitive kotlin.stdlib;
     requires kotlin.stdlib.jdk7;