sp-debug-derive: Add force-debug feature (#9996)

* sp-debug-derive: Add `force-debug` feature

Sometimes users want to have proper debug information even inside the
wasm runtime, when they use `RuntimeDebug`. To not fork Substrate to
change a type to a normal `Debug` derive, this pr introduces the
`force-debug` feature. This feature can be enabled by the user in their
runtime and then the types will use the normal Debug derive instead of
printing `wasm:stripped`.

* Fixes

substrate/primitives/debug-derive/src/impls.rs

@@ -43,7 +43,7 @@ pub fn debug_derive(ast: DeriveInput) -> proc_macro::TokenStream {
 	gen.into()
 }
 
-#[cfg(not(feature = "std"))]
+#[cfg(all(not(feature = "std"), not(feature = "force-debug")))]
 mod implementation {
 	use super::*;
 
@@ -58,7 +58,7 @@ mod implementation {
 	}
 }
 
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "force-debug"))]
 mod implementation {
 	use super::*;
 	use proc_macro2::Span;