docs(x/accounts/defaults/lockup): Add tutorial document (backport #22168)

[mergify]

Description

Closes: #XXXX

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Summary by CodeRabbit

• New Features
  • Introduced a comprehensive tutorial for using lockup accounts within the Cosmos SDK, covering setup, initialization, execution, and querying.
• Documentation
  • Added detailed instructions and examples for creating wallets, initializing lockup accounts, executing operations, and querying account states.

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This is an automatic backport of pull request #22168 done by [Mergify](https://mergify.com).