chore/error: remove from str conversion and add deprecation notificat… (#7472)

* chore/error: remove from str conversion and add deprecation notifications

* fixup changes

* fix test looking for gone ::Msg variant

* another test fix

* one is duplicate, the other is not, so duplicates reported are n-1

* darn spaces

Co-authored-by: Andronik Ordian <write@reusable.software>

* remove pointless doc comments of error variants without any value

* low hanging fruits (for a tall person)

* moar error type variants

* avoid the storage modules for now

They are in need of a refactor, and the pain is rather large
removing all String error and DefaultError occurences.

* chore remove pointless error generic

* fix test for mocks, add a bunch of non_exhaustive

* max line width

* test fixes due to error changes

* fin

* error outputs... again

* undo stderr adjustments

* Update client/consensus/slots/src/lib.rs

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

* remove closure clutter

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

* more error types

* introduce ApiError

* extract Mock error

* ApiError refactor

* even more error types

* the last for now

* chore unused deps

* another extraction

* reduce should panic, due to extended error messages

* error test happiness

* shift error lines by one

* doc tests

* white space

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

* Into -> From

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

* remove pointless codec

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

* avoid pointless self import

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

Co-authored-by: Bernhard Schuster <bernhard@parity.io>
Co-authored-by: Andronik Ordian <write@reusable.software>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/primitives/api/Cargo.toml

@@ -21,6 +21,7 @@ sp-runtime = { version = "2.0.0", default-features = false, path = "../runtime"
 sp-version = { version = "2.0.0", default-features = false, path = "../version" }
 sp-state-machine = { version = "0.8.0", optional = true, path = "../../primitives/state-machine" }
 hash-db = { version = "0.15.2", optional = true }
+thiserror = { version = "1.0.21", optional = true }
 
 [dev-dependencies]
 sp-test-primitives = { version = "2.0.0", path = "../test-primitives" }
@@ -35,4 +36,5 @@ std = [
 	"sp-state-machine",
 	"sp-version/std",
 	"hash-db",
+	"thiserror",
 ]