fatality based errors (#4448)

* seed commit for fatality based errors

* fatality

* first draft of fatality

* cleanup

* differnt approach

* simplify

* first working version for enums, with documentation

* add split

* fix simple split test case

* extend README.md

* update fatality impl

* make tests passed

* apply fatality to first subsystem

* fatality fixes

* use fatality in a subsystem

* fix subsystemg

* fixup proc macro

* fix/test: log::*! do not execute when log handler is missing

* fix spelling

* rename Runtime2 to something sane

* allow nested split with `forward` annotations

* add free license

* enable and fixup all tests

* use external fatality

Makes this more reviewable.

* bump fatality dep

Avoid duplicate expander compilations.

* migrate availability distribution

* more fatality usage

* chore: bump fatality to 0.0.6

* fixup remaining subsystems

* chore: fmt

* make cargo spellcheck happy

* remove single instance of `#[fatal(false)]`

* last quality sweep

* fixup

polkadot/node/core/parachains-inherent/src/lib.rs

@@ -117,8 +117,8 @@ impl sp_inherents::InherentDataProvider for ParachainsInherentDataProvider {
 
 	async fn try_handle_error(
 		&self,
-		_: &sp_inherents::InherentIdentifier,
-		_: &[u8],
+		_identifier: &sp_inherents::InherentIdentifier,
+		_error: &[u8],
 	) -> Option<Result<(), sp_inherents::Error>> {
 		// Inherent isn't checked and can not return any error
 		None