fix(accounts-controller): export * in index (#5224)

## Explanation

Each exports were done manually, which is quite error-prone IMO.

Looks like some other controllers already uses `export * from ...`, so I
believe this will make our `export`s a bit more future-proof.

Also, if any functions/constants should not be part of the public API,
we could use another folder like `details` or `internal` and put those
files there.

## References

N/A

## Changelog

### `@metamask/accounts-controller`

- **CHANGED**: Properly exports everything

## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've highlighted breaking changes using the "BREAKING" category
above as appropriate
- [ ] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

packages/accounts-controller/src/index.ts

@@ -1,26 +1,2 @@
-export type {
-  AccountsControllerState,
-  AccountsControllerGetStateAction,
-  AccountsControllerSetSelectedAccountAction,
-  AccountsControllerSetAccountNameAction,
-  AccountsControllerListAccountsAction,
-  AccountsControllerListMultichainAccountsAction,
-  AccountsControllerUpdateAccountsAction,
-  AccountsControllerGetSelectedAccountAction,
-  AccountsControllerGetSelectedMultichainAccountAction,
-  AccountsControllerGetAccountByAddressAction,
-  AccountsControllerGetAccountAction,
-  AccountsControllerGetNextAvailableAccountNameAction,
-  AccountsControllerUpdateAccountMetadataAction,
-  AccountsControllerActions,
-  AccountsControllerChangeEvent,
-  AccountsControllerSelectedAccountChangeEvent,
-  AccountsControllerSelectedEvmAccountChangeEvent,
-  AccountsControllerAccountAddedEvent,
-  AccountsControllerAccountRemovedEvent,
-  AccountsControllerAccountRenamedEvent,
-  AccountsControllerEvents,
-  AccountsControllerMessenger,
-} from './AccountsController';
-export { AccountsController } from './AccountsController';
-export { keyringTypeToName, getUUIDFromAddressOfNormalAccount } from './utils';
+export * from './AccountsController';
+export * from './utils';