Auto-incremental CollectionId (#11796)

* autoincrementing CollectionId

* fix

* benchmarking fix

* fmt

* fix

* update before checking

* fmt

* fix

* fmt

* commit

* tests & fix

* fix

* commit

* docs

* safe math

* unexpose function

* benchmark

* fmt

* better naming

* fix?

* merge fixes

* fmt

* ".git/.scripts/bench-bot.sh" pallet dev pallet_uniques

* wrong weight

* Update frame/uniques/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update frame/uniques/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* using substrate trait instead of num-traits

* remove unnecessary trait

* emit NextCollectionIdIncremented in do_create_collection

* fix in benchmarks

* check for event & group import

* docs

Co-authored-by: Sergej Sakač <sergejsakac@Sergejs-MacBook-Air.local>
Co-authored-by: command-bot <>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>