Created & implemented DummyTraffic interface

xxclient/src/main/java/io/elixxir/xxclient/dummytraffic/DummyTraffic.kt

+package io.elixxir.xxclient.dummytraffic
+
+import bindings.DummyTraffic as DummyTrafficBindings
+
+interface DummyTraffic {
+    var enabled: Boolean
+}
+
+open class DummyTrafficAdapter(protected val dt: DummyTrafficBindings) : DummyTraffic {
+    override var enabled: Boolean by dt::status
+}
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