Update Identity pallet to Frame V2 (#8697)

* bump pallet to frame v2

* line width

* get benchmarking ot compile

* fix benchmarking now

* should actually fix benchmark

* make docs prettier

* add dependency

* add metadata

* Update frame/identity/src/benchmarking.rs

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

Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Guillaume Thiolliere <[email protected]>