working hasGlobalAdminRole and prepare for Micrometer metrics with Spring Security (#127)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: https://dev.hostsharing.net/hostsharing/hs.hsadmin.ng/pulls/127
Reviewed-by: Marc Sandlus <marc.sandlus@hostsharing.net>

etc/allowed-licenses.json

@@ -43,6 +43,11 @@
 
         { "moduleLicense": "WTFPL" },
 
+        {
+            "moduleLicense": "Public Domain, per Creative Commons CC0",
+            "moduleVersion": "2.0.3"
+        },
+
         {
             "moduleLicense": null,
             "#moduleLicense": "Apache License 2.0, see https://github.com/springdoc/springdoc-openapi/blob/main/LICENSE",