Server startup banner (#912)

* server startup banner added

* font changed

Co-authored-by: Ilya Kuramshin <ikuramshin@provectus.com>

kafka-ui-api/src/main/resources/banner.txt

@@ -0,0 +1,7 @@
+
+  _  __      __ _               _   _ ___
+ | |/ /__ _ / _| | ____ _      | | | |_ _|
+ | ' // _` | |_| |/ / _` |_____| | | || |
+ | . \ (_| |  _|   < (_| |_____| |_| || |
+ |_|\_\__,_|_| |_|\_\__,_|      \___/|___|
+