[ADF-2477] add new log component in demo shell (#3129)

* add CTRL + L new log component in demo shell to test the log service bus

* remove trivial definition

* close tag app-log

demo-shell/src/app/components/log/log.component.css

@@ -0,0 +1,27 @@
+.log-list-type {
+    float: left;
+}
+
+.log-list-text {
+    float: left;
+}
+
+.log-card {
+    min-width: 200px;
+    z-index: 1;
+    height: 20%;
+    width: 40%;
+    position: fixed;
+    top: 1em;
+    right: 1em;
+    opacity: 0.9;
+    overflow: scroll;
+}
+
+.log-ERROR {
+    color: red;
+}
+
+.log-WARN {
+    color: yellow;
+}