Extract javax.annotations from third-party/foreign-annotations

Later, JSR 305 related classes will be used to be compiled in a separate
jar that will be used to compile Java, but would be absent in the
Kotlin classpath in ForeignAnnotations-related tests

It's necessary to have a proper test for KT-56656

third-party/jsr305/javax/annotation/Nullable.java

@@ -0,0 +1,16 @@
+package javax.annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import javax.annotation.meta.TypeQualifierNickname;
+import javax.annotation.meta.When;
+
+@Documented
+@TypeQualifierNickname
+@Nonnull(when = When.UNKNOWN)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Nullable {
+
+}