Mandatory dispatch class (#5515)

* Mandatory dispatch class

* Tweaks

* Docs

* Fix test

* Update frame/support/src/weights.rs

Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Introduce logic that was stated in PR.

* Use

* Docs.

* Fix test

* Fix merge

* Update frame/support/src/weights.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* Fix.

* Fix

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/frame/timestamp/src/lib.rs

@@ -147,7 +147,7 @@ decl_module! {
 		/// `MinimumPeriod`.
 		///
 		/// The dispatch origin for this call must be `Inherent`.
-		#[weight = SimpleDispatchInfo::FixedOperational(10_000)]
+		#[weight = SimpleDispatchInfo::FixedMandatory(10_000)]
 		fn set(origin, #[compact] now: T::Moment) {
 			ensure_none(origin)?;
 			assert!(!<Self as Store>::DidUpdate::exists(), "Timestamp must be updated only once in the block");