feat: add support for Desmos features

[RiccardoM]

Description

This PR implements all the Desmos-related features.

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
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• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
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• confirmed the correct type prefix in the PR title
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• confirmed all author checklist items have been addressed
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)