Better identifier and logging for runtime upgrades (#8123)

* A clean new attempt

* Checkpoint to move remote.

* A lot of dependency wiring to make it feature gated.

* bad macro, bad macro.

* Undo the DB mess.

* Update frame/support/src/traits.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Apply suggestions from code review

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* unbreak the build

* Better logging and ids for migrations

* Fix doc.

* Test

* Update frame/try-runtime/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update utils/frame/try-runtime/cli/Cargo.toml

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/try-runtime/Cargo.toml

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Address most review grumbles.

* Fix build

* Add some comments

* Remove allowing one pallet at a time.

* Rework the PR

* nit

* Slightly better error handling.

* Remove files

* Update utils/frame/remote-externalities/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update frame/support/src/dispatch.rs

* Update frame/support/src/dispatch.rs

* Fix test

* Make extension trait.

* Bring back try-runtime/std

* remove bincode

* Remove warning

* Change test features

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/frame/support/src/lib.rs

@@ -80,6 +80,9 @@ pub use self::storage::{
 pub use self::dispatch::{Parameter, Callable};
 pub use sp_runtime::{self, ConsensusEngineId, print, traits::Printable};
 
+/// A unified log target for support operations.
+pub const LOG_TARGET: &'static str = "runtime::frame-support";
+
 /// A type that cannot be instantiated.
 #[derive(Debug, PartialEq, Eq, Clone)]
 pub enum Never {}