Upgrade authorship pallet to Frame-v2 (#8663)

* first commit

* get to compile

* fix deprecated grandpa

* formatting

* module to pallet

* add authorship pallet to mocks

* Fix upgrade of storage.

Co-authored-by: Xiliang Chen <[email protected]>

* trigger CI

* put back doc

Co-authored-by: Guillaume Thiolliere <[email protected]>
Co-authored-by: Xiliang Chen <[email protected]>