Audit x/tx v0.47...v0.50

[facundomedica]

No description provided.

[facundomedica]

Overall lgtm, my confidence is low on my audit here tho, I'm not too familiar with it:

• Lots of new code
• We might want to add more tests to ensure compatibility of AminoJSON (coverage is 51% right now)
• textual was audited recently by internal and external auditors

I'll do another round later this week/next week

[alexanderbez]

As mentioned previously, this package introduced a fair amount of new code and moving existing pieces from other packages. After reviewing the code, I can't see anything major concerns apart from low test coverage as @facundomedica mentioned. General overview of changes:

• Context type
• Signer mode and signer data
• Signing mode implementations
  • Textual needs more test coverage