subxt: Derive std::cmp traits for subxt payloads and addresses (#1429)

* subxt/tx: Derive std::cmp traits

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt/runtime_api: Derive std::cmp traits

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt/constants: Derive std::cmp traits

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt/custom_values: Derive std::cmp traits

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt/storage: Derive std::cmp traits

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Fix non_canonical_partial_ord_impl clippy introduced in 1.73

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Add comment wrt derivative issue that triggers clippy warning

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Update subxt/src/backend/mod.rs

* Update subxt/src/constants/constant_address.rs

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

subxt/src/constants/constant_address.rs

@@ -28,7 +28,13 @@ pub trait ConstantAddress {
 
 /// This represents the address of a constant.
 #[derive(Derivative)]
-#[derivative(Clone(bound = ""), Debug(bound = ""))]
+#[derivative(
+    Clone(bound = ""),
+    Debug(bound = ""),
+    Eq(bound = ""),
+    Ord(bound = ""),
+    PartialEq(bound = "")
+)]
 pub struct Address<ReturnTy> {
     pallet_name: Cow<'static, str>,
     constant_name: Cow<'static, str>,
@@ -36,6 +42,13 @@ pub struct Address<ReturnTy> {
     _marker: std::marker::PhantomData<ReturnTy>,
 }
 
+// Manual implementation to work around https://github.com/mcarton/rust-derivative/issues/115.
+impl<ReturnTy> PartialOrd for Address<ReturnTy> {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
 /// The type of address typically used to return dynamic constant values.
 pub type DynamicAddress = Address<DecodedValueThunk>;