Migrate pallet-balances to pallet attribute macro (#7936)

* Initial migration of balances pallet

* Fix some errors

* Remove unused imports

* Formatting and removing some todos

* Delete Subtrait

* Add genesis builder impls for tests

* Fix GenesisConfig impl

* Make set_balance visible to tests, rename RawEvent to Event

* Fix tests with Event rename etc.

* More test RawEvent renames

* Even more RawEvent renames

* Rename module to pallet in comments

* Add PalletInfo impl to avid storage collision, fixes tests

* Apply review suggestion: remove trailing a

Co-authored-by: David <[email protected]>

* BalancesEvent alias

* Remove BalancesEvent alias

* Review suggestion: remove redundant comment

* Apply review suggestion: make vis super

* Fis doc links

* Add RawEvent alias

* Add missing Instance parameter to deprecated RawEvent alias

* Fix RawEvent deprecation warnings

Co-authored-by: David <[email protected]>