[Epic]: x/accounts (part 2)

[julienrbrt]

Extract uncompleted steps from #17786

BaseAccount & x/accounts

• Address Scheme feat(accounts): Decide on address creation scheme #17516 [audit]
• Add migration message to migrate x/auth account to x/accounts (ref feat(auth): allow BaseAccounts to be migrated to x/accounts #21820)
• Make auth check also for x/accounts state when checking for account existence. (ref feat(auth): support accounts from auth #21688)
• feat(accounts): re-introduce bundler #21562
• Account upgrability
• Multi account support
• Take over and finish feat (accounts/base): Add passkey support to base account type.  #21755

Authz alternative

• Add simple authz style accounts @sontrinh16
• Authorized execution from sender (authorize the account to execute an action on behalf of the invoker, eg: coin send) @sontrinh16

Fee grant

• Look into how to make feegrant work with accounts