deps: update the capability module to use the latest sdk 50 code

[faddat]

Description

This PR updates the capability module to use the latest sdk 50 code.

#4398 should be merged first, since this PR contains significant chunks of that one.

Commit Message / Changelog Entry

deps: update the capability module to use the latest 
sdk 50 code

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• Wrote unit and integration tests.
• Updated relevant documentation (docs/) or specification (x/<module>/spec/).
• Added relevant godoc comments.
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[faddat]

I'm closing this also, because it will be easily remade on top of #4398