refactor: make x/evidence a standalone module

[likhita-809]

Description

Closes: #14557

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[julienrbrt]

lgtm!

Other nits: can you add a module UPGRADING.md section mentioning the extraction of evidence, nft in their go.mod (and their renaming)? As well as a CHANGELOG, mentioning the extraction and renaming, in the main changelog and evidence/CHANGELOG? Additionally, the import grouping seems sometimes weird.

[sonarcloud]

[Cosmos SDK - x/evidence] Kudos, SonarCloud Quality Gate passed!   

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[julienrbrt]

@likhita-809, could you revert the permission of protocgen.sh to 755?