Expose block number in seal_random (#8329)

* Allow contract callable functions to specify the module

* Add new version of `seal_random`

* Fix overlong lines

* Fix benchmarking code

* Update README.md

* Replace Module by Pallet

substrate/frame/contracts/src/wasm/env_def/mod.rs

@@ -74,7 +74,7 @@ pub type HostFunc<E> =
 	) -> Result<sp_sandbox::ReturnValue, sp_sandbox::HostError>;
 
 pub trait FunctionImplProvider<E: Ext> {
-	fn impls<F: FnMut(&[u8], HostFunc<E>)>(f: &mut F);
+	fn impls<F: FnMut(&[u8], &[u8], HostFunc<E>)>(f: &mut F);
 }
 
 /// This trait can be used to check whether the host environment can satisfy
@@ -83,5 +83,5 @@ pub trait ImportSatisfyCheck {
 	/// Returns `true` if the host environment contains a function with
 	/// the specified name and its type matches to the given type, or `false`
 	/// otherwise.
-	fn can_satisfy(name: &[u8], func_type: &FunctionType) -> bool;
+	fn can_satisfy(module: &[u8], name: &[u8], func_type: &FunctionType) -> bool;
 }