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/network/collator-protocol/Cargo.toml

@@ -6,10 +6,8 @@ edition = "2021"
 
 [dependencies]
 always-assert = "0.1.2"
-derive_more = "0.99.17"
 futures = "0.3.21"
 futures-timer = "3"
-thiserror = "1.0.30"
 tracing = "0.1.31"
 
 sp-core = { git = "https://github.com/paritytech/substrate", branch = "master" }
@@ -21,6 +19,8 @@ polkadot-node-network-protocol = { path = "../../network/protocol" }
 polkadot-node-primitives = { path = "../../primitives" }
 polkadot-node-subsystem-util = { path = "../../subsystem-util" }
 polkadot-subsystem = { package = "polkadot-node-subsystem", path = "../../subsystem" }
+fatality = "0.0.6"
+thiserror = "1.0.30"
 
 [dev-dependencies]
 log = "0.4.13"