Allow longer locks in pilot rounds

[dusan-maksimovic]

Description

Starting from V2, we want to allow users to create 1, 2 or 3 rounds long lockups.

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Author Checklist

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I have...

• Targeted the correct branch
• Included the necessary unit tests
• Added/adjusted the necessary interchain tests
• Added a changelog entry in .changelog
• Compiled the contracts by using make compile and included content of the artifacts directory into the PR
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• Updated the relevant documentation or specification
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