build: add scripts to update all go.mod's at once

[aaronc]

Following up on #10582 (reply in thread), this PR adds two scripts that update all go.mod's at once:

• scripts/go-update-dep-all.sh updates a dependency in all go.mod's which use it
• scripts/go-mod-tidy-all.sh runs go mod tidy in all go.mod's

It also updates the cosmos-proto dep as an example

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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
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• 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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[tac0turtle]

lgtm, can you add a sentence to the contributing about this