Appease Clippy 1.68 and refactor http_api (#4068)

## Proposed Changes

Two tiny updates to satisfy Clippy 1.68

Plus refactoring of the `http_api` into less complex types so the compiler can chew and digest them more easily.

Co-authored-by: Michael Sproul <michael@sigmaprime.io>

common/warp_utils/src/uor.rs

@@ -0,0 +1,25 @@
+use warp::{filters::BoxedFilter, Filter, Rejection};
+
+/// Mixin trait for `Filter` providing the unifying-or method.
+pub trait UnifyingOrFilter: Filter<Error = Rejection> + Sized + Send + Sync + 'static
+where
+    Self::Extract: Send,
+{
+    /// Unifying `or`.
+    ///
+    /// This is a shorthand for `self.or(other).unify().boxed()`, which is useful because it keeps
+    /// the filter type simple and prevents type-checker explosions.
+    fn uor<F>(self, other: F) -> BoxedFilter<Self::Extract>
+    where
+        F: Filter<Extract = Self::Extract, Error = Rejection> + Clone + Send + Sync + 'static,
+    {
+        self.or(other).unify().boxed()
+    }
+}
+
+impl<F> UnifyingOrFilter for F
+where
+    F: Filter<Error = Rejection> + Sized + Send + Sync + 'static,
+    F::Extract: Send,
+{
+}