Contracts: Update Config::Debug (#14789)

* Update Debug trait

* Rename

* tweak

* fmt

* Better namings

* rm unsafe-debug

* rework doc

* nit

* fix comment

* clippy

* update naming

* Rename file

* fmt fixes

* rename

* Move tracing behind umbrella Debugging trait

* fix

* fix comment

* reorder imports

* comment

* update doc

* add missing doc

* add missing doc

* Update Debugging -> Debugger

* Update bin/node/runtime/Cargo.toml

substrate/frame/contracts/src/exec.rs

@@ -15,9 +15,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(feature = "unsafe-debug")]
-use crate::unsafe_debug::ExecutionObserver;
 use crate::{
+	debug::{CallSpan, Tracing},
 	gas::GasMeter,
 	storage::{self, meter::Diff, WriteOutcome},
 	BalanceOf, CodeHash, CodeInfo, CodeInfoOf, Config, ContractInfo, ContractInfoOf,
@@ -908,20 +907,15 @@ where
 			// Every non delegate call or instantiate also optionally transfers the balance.
 			self.initial_transfer()?;
 
-			#[cfg(feature = "unsafe-debug")]
-			let (code_hash, input_clone) = {
-				let code_hash = *executable.code_hash();
-				T::Debug::before_call(&code_hash, entry_point, &input_data);
-				(code_hash, input_data.clone())
-			};
+			let call_span =
+				T::Debug::new_call_span(executable.code_hash(), entry_point, &input_data);
 
 			// Call into the Wasm blob.
 			let output = executable
 				.execute(self, &entry_point, input_data)
 				.map_err(|e| ExecError { error: e.error, origin: ErrorOrigin::Callee })?;
 
-			#[cfg(feature = "unsafe-debug")]
-			T::Debug::after_call(&code_hash, entry_point, input_clone, &output);
+			call_span.after_call(&output);
 
 			// Avoid useless work that would be reverted anyways.
 			if output.did_revert() {