refactoring: move xml definitions for bucket cors/lifecycle/website config

move these defnitions to garage_api_common so that they can also be used
in admin api

src/api/common/Cargo.toml

@@ -41,6 +41,7 @@ hyper = { workspace = true, default-features = false, features = ["server", "htt
 hyper-util.workspace = true
 url.workspace = true
 
+quick-xml.workspace = true
 serde.workspace = true
 serde_json.workspace = true