fix(accounts-controller): export missing actions (#4497)

## Explanation

Those actions were not properly exported.

## References

None

## Changelog

### `@metamask/accounts-controller`

- **FIXED**: Export missing
`AccountsController{ListMultichainAccounts,GetSelectedMultichainAccount,GetNextAvailableAccountName}Action`

## 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

Co-authored-by: Monte Lai <[email protected]>

Author: ccharly

packages/accounts-controller/src/index.ts

@@ -4,10 +4,13 @@ export type {
   AccountsControllerSetSelectedAccountAction,
   AccountsControllerSetAccountNameAction,
   AccountsControllerListAccountsAction,
+  AccountsControllerListMultichainAccountsAction,
   AccountsControllerUpdateAccountsAction,
   AccountsControllerGetSelectedAccountAction,
+  AccountsControllerGetSelectedMultichainAccountAction,
   AccountsControllerGetAccountByAddressAction,
   AccountsControllerGetAccountAction,
+  AccountsControllerGetNextAvailableAccountNameAction,
   AccountsControllerActions,
   AccountsControllerChangeEvent,
   AccountsControllerSelectedAccountChangeEvent,