refactor: rename access_token to authorization_code

rename header auth-token to access-token

Author: BFergerson

.spp/spp-plugin.yml

@@ -1,4 +1,4 @@
 override: true
 service_host: "http://localhost"
-access_token: "change-me"
+authorization_code: "change-me"
 service_name: "example-jvm"