chore(x/auth): deprecate legacy aminojson sign mode

[kocubinski]

Description

Ref: #16094

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Author Checklist

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please add links to any relevant follow up issues.

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
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• 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)

[aaronc]

Deprecated: needs to come at the start of a paragraph. Not sure this will actually get picked up by go tooling. Can you confirm whether it does work or update the doc comments @kocubinski ?

[kocubinski]

Deprecated: needs to come at the start of a paragraph. Not sure this will actually get picked up by go tooling. Can you confirm whether it does work or update the doc comments @kocubinski ?

Yes I can confirm that this works with tooling I am using. The strikethroughs indicate a deprecated method.