feat(account-api): add missing {align,discover}Accounts (#368)

Those methods were already implemented in the
`multichain-account-service`. We now add them at API level so we can
rely on the API type `MultichainAccountWallet` to execute those
operations.

> [!NOTE]
> The name are also different now, to emphasis more on the actual
operations being run on on the "blockchain accounts" themselves:
`<operation>Accounts`

Author: ccharly

packages/account-api/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- **BREAKING:** Add `MultichainAccountWallet.{align,discover}Accounts` methods ([#368](https://github.com/MetaMask/accounts/pull/368))
 - Add wallet `status` ([#367](https://github.com/MetaMask/accounts/pull/367))
 
 ### Changed

packages/account-api/src/api/multichain/wallet.ts

@@ -112,6 +112,18 @@ export type MultichainAccountWallet<
    * @returns The multichain accounts.
    */
   getMultichainAccountGroups(): MultichainAccountGroup<Account>[];
+
+  /**
+   * Discover and create accounts.
+   *
+   * @returns The discovered accounts.
+   */
+  discoverAccounts(): Promise<Account[]>;
+
+  /**
+   * Align all accounts accross existing multichain account groups.
+   */
+  alignAccounts(): Promise<void>;
 };
 
 /**