Add rxjava3 to third_party

Closes: bazelbuild#12803

third_party/BUILD

@@ -525,6 +525,18 @@ distrib_java_import(
     srcjar = "javax_annotations/javax.annotation-api-1.3.2-sources.jar",
 )
 
+java_import(
+    name = "reactive_streams",
+    jars = ["reactive_streams/reactive-streams-1.0.3.jar"],
+)
+
+java_import(
+    name = "rxjava3",
+    jars = ["rxjava3/rxjava-3.0.9.jar"],
+    exports = [":reactive_streams"],
+    deps = [":reactive_streams"],
+)
+
 java_import(
     name = "jimfs",
     jars = ["jimfs/jimfs-1.1.jar"],

third_party/reactive_streams/LICENSE

@@ -0,0 +1,121 @@
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third_party/rxjava3/LICENSE

@@ -0,0 +1,202 @@
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