frame: support for serde added (#14261)

* frame: support for serde added

- enabled `serde` features in dependent crates, no gate feature introduced, linker should do the job and strip unused code.

- frame::staking: added impl of `serde::Serialize, serde::Deserialize` for `enum Forcing`

- primitives::runtime: impl_opaque_keys macro provides `Serialize/Deserialize` impl if `serde` is enabled

- primitives::staking: added impl of `serde::Serialize`, `serde::Deserialize` for `enum StakerStatus`

* frame::support: serde for pallets' GenesisConfig enabled in no-std

* Cargo.lock updated

* Update primitives/staking/Cargo.toml

Co-authored-by: Bastian Köcher <git@kchr.de>

* fix

* Cargo.lock update + missed serde/std in beefy

---------

Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/primitives/runtime/src/traits.rs

@@ -1772,7 +1772,7 @@ macro_rules! impl_opaque_keys_inner {
 /// }
 /// ```
 #[macro_export]
-#[cfg(feature = "std")]
+#[cfg(any(feature = "serde", feature = "std"))]
 macro_rules! impl_opaque_keys {
 	{
 		$( #[ $attr:meta ] )*
@@ -1802,7 +1802,7 @@ macro_rules! impl_opaque_keys {
 }
 
 #[macro_export]
-#[cfg(not(feature = "std"))]
+#[cfg(all(not(feature = "std"), not(feature = "serde")))]
 #[doc(hidden)]
 macro_rules! impl_opaque_keys {
 	{

substrate/primitives/staking/Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-serde = { version = "1.0.163", optional = true }
+serde = { version = "1.0.163", default-features = false, features = ["derive", "alloc"], optional = true }
 codec = { package = "parity-scale-codec", version = "3.2.2", default-features = false, features = ["derive"] }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
 sp-core = { version = "21.0.0", default-features = false, path = "../core" }
@@ -23,7 +23,7 @@ sp-std = { version = "8.0.0", default-features = false, path = "../std" }
 [features]
 default = ["std"]
 std = [
-	"serde",
+	"serde/std",
 	"codec/std",
 	"scale-info/std",
 	"sp-core/std",

substrate/primitives/staking/src/lib.rs

@@ -35,7 +35,7 @@ pub type EraIndex = u32;
 
 /// Representation of the status of a staker.
 #[derive(RuntimeDebug, TypeInfo)]
-#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize, PartialEq, Eq, Clone))]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize, PartialEq, Eq, Clone))]
 pub enum StakerStatus<AccountId> {
 	/// Chilling.
 	Idle,