refactor code to use Shrinkwraprs and diesel-derive-newtype (#598)

* add shrinkwraprs and implement Id thru it

This also means we can automatically convert Id to String without using
.into()!

* cleanup with the help of clippy!

* cleanup with the help of cargo fmt!

* remove extra block

* Shrinkwrap Page, ContentLen and RemoteForm

* translations

plume-common/src/activity_pub/mod.rs

@@ -163,18 +163,12 @@ where
     }
 }
 
-#[derive(Clone, Serialize, Deserialize)]
+#[derive(Shrinkwrap, Clone, Serialize, Deserialize)]
 pub struct Id(String);
 
 impl Id {
-    pub fn new<T: Into<String>>(id: T) -> Id {
-        Id(id.into())
-    }
-}
-
-impl Into<String> for Id {
-    fn into(self) -> String {
-        self.0.clone()
+    pub fn new(id: impl ToString) -> Id {
+        Id(id.to_string())
     }
 }