fix(simapp): concurrent map writes when calling GetSigners (backport #21073)

[mergify]

Description

Whenever GetSigners is called and the getSignerFn hasn't been set for the message type, it will set it on an internal map. If this is called in 2 or more places at the same time it will cause a concurrent map write issue.

To avoid this, developers must call interfaceRegistry.SigningContext().Validate() when creating the app (depinject users don't need this as it's being done when providing the interfaceRegistry).

Also, a write only mutex has been added as a defensive measure in case there's any unhandled case (most likely because of a misconfiguration, or usage of multiple instances of SigningContexts). This shouldn't add any overhead to well configured binaries, and little to misconfigured ones.

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Summary by CodeRabbit

• New Features

  • Introduced a validation step during context initialization to enhance robustness and error handling.
  • Improved the method for retrieving signer functions to utilize thread-safe access for better reliability.
  • Added new tests to ensure concurrency behavior of signer function retrieval.

• Bug Fixes

  • Resolved potential data corruption issues by safeguarding access to the signers' function map with concurrency controls.

• Documentation

  • Updated the changelog for the x/tx module to reflect recent improvements and enhancements.

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This is an automatic backport of pull request #21073 done by [Mergify](https://mergify.com).

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[julienrbrt]

We only need to backport simapp changes

[github-actions]

@julienrbrt your pull request is missing a changelog!