[fix] update max interval and enable audi timestamp

[kamilsa]

Referenced issues

#2351

Description of the Change

• Returns audi timestamp
• Decreases address publishing interval to 5 minutes
• Starts publishing addresses before we became an authority (same behaviour as in polkadot-sdk)

Possible Drawbacks

Too frequent publishing interval comparing to polkadot sdk

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1. Code is formatted: Have you run your code through clang-format to ensure it adheres to the project's coding standards? Yes
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