Spring Cleaning → removing obsolete stuff, and moved non-app things to ./etc (#810)

* Remove obsolete stuff, and moved non-app things to ./etc
* remove test
* Update package-lock

---------

Co-authored-by: Christian Georgi <christian.georgi@sap.com>

etc/loggers/srv/loggers.cds

@@ -0,0 +1,20 @@
+@rest service LogService {
+
+  @readonly entity Loggers : Logger {};
+  entity Logger {
+    key id : String;
+    level  : String;
+  }
+
+  action format (
+    timestamp : Boolean,
+    level     : Boolean,
+    tenant    : Boolean,
+    reqid     : Boolean,
+    id        : Boolean,
+  );
+
+  action debug (logger : String) returns Logger;
+  action reset (logger : String) returns Logger;
+
+}