New root_testing pallet (#12451)

* Move fill_block to RootOffences

* docs

* new pallet

* new line

* fix

* Update frame/root-testing/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/root-testing/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update bin/node/runtime/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/root-testing/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/root-testing/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Update frame/root-testing/src/lib.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* fixes

* problem solved

* revert

* fix dependency

* hopefully making the CI happy

* ...

* dummy call

* remove dummy

* fix warning

Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/frame/root-offences/src/lib.rs

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! # Sudo Offences Pallet
+//! # Root Offences Pallet
 //! Pallet that allows the root to create an offence.
 //!
 //! NOTE: This pallet should be used for testing purposes.