feat: update margin CLI api and add CLI examples

[cosmic-vagabond]

Description

Closes:

• https://github.com/elys-network/issues/issues/414

What has Changed?

Update margin CLI api to align with other modules structure

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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
• followed the guidelines for building modules
• included the necessary unit and integration tests
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
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• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

Deployment Notes

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[kenta-elys]

@cosmic-vagabond
Could you fix unit tests failure?

[cosmic-vagabond]

@cosmic-vagabond Could you fix unit tests failure?

I pushed a new commit that fixes the unit tests issues

[cosmic-vagabond]

@jelysn all the examples got updated to use uusdc and uatom instead

[jelysn]

LGTM