contracts: Move Schedule from Storage to Config (#8773)

* Move `Schedule` from Storage to Config

* Updated CHANGELOG

* Fix nits from review

* Fix migration

* Print the debug buffer as tracing message

* Use `debug` instead of `trace` and update README

* Add additional assert to test

* Rename `schedule_version` to `instruction_weights_version`

* Fixed typo

* Added more comments to wat fixtures

* Add clarification for the `debug_message` field

substrate/frame/contracts/fixtures/debug_message_logging_disabled.wat

@@ -0,0 +1,28 @@
+;; Emit a "Hello World!" debug message but assume that logging is disabled.
+(module
+	(import "seal0" "seal_debug_message" (func $seal_debug_message (param i32 i32) (result i32)))
+	(import "env" "memory" (memory 1 1))
+
+	(data (i32.const 0) "Hello World!")
+
+	(func $assert_eq (param i32 i32)
+		(block $ok
+			(br_if $ok
+				(i32.eq (get_local 0) (get_local 1))
+			)
+			(unreachable)
+		)
+	)
+
+	(func (export "call")
+		(call $assert_eq
+			(call $seal_debug_message
+				(i32.const 0)	;; Pointer to the text buffer
+				(i32.const 12)	;; The size of the buffer
+			)
+			(i32.const 9)	;; LoggingDisabled return code
+		)
+	)
+
+	(func (export "deploy"))
+)