feat: Updated the onComplete props structure on export account

[hcho112]

Description

This PR contains minor change on the structure of onComplete props from
Array to { accounts: Array , walletName string}

As outcome, console.log on example should be similar to:

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Type of change.

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