feat(cli): support recovering nested associated token accounts

[ink-splatters]

Description

Add recover-nested CLI command that:

• transfers the stranded balance into the user’s associated token account;
• closes the nested account and returns its rent to the wallet owner.

The command invokes the existing instruction: RecoverNested of the Associated Token Account program.

Rationale

A sender can reuse the address of an associated token account which had been closed [e.g. to reclaim rent].

Some wallets treat such addresses as wallet owners and ask the Associated Token Account program to create another token account for the payment.

The resulting nested account is not listed under the recipient’s wallet, and recovering its balance currently requires custom code.

[kimjune01]

recover-nested fails in the closed-owner-ATA case described by this PR. I closed the empty owner ATA before the CLI call, and the command failed with Provided owner is not allowed. The ATA processor said to recreate the owner ATA first.

The current test leaves that account open, and the command submits only the recover_nested instruction. In the same_mint case, the missing owner ATA is also the destination.

The closed-account setup should be covered by the test. The required ATA(s) should either be recreated by the command or documented as a prerequisite.