Refactor rc_microtransactions to use actix-web, remove rocket dependency

rc_microtransactions/Cargo.toml

@@ -8,8 +8,11 @@ repository.workspace = true
 authors.workspace = true
 
 [dependencies]
-rocket.workspace = true
+actix-web.workspace = true
 libfj.workspace = true
 log.workspace = true
 env_logger.workspace = true
 git-version.workspace = true
+clap.workspace = true
+serde.workspace = true
+serde_json.workspace = true