feat: support gov v1 proposals

[RiccardoM]

Description

This PR aims at updating the codebase in order to properlty support x/gov new v1 proposal types and inner workings.

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
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
• provided a link to the relevant issue or specification
• 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

All items are required. Please add a note if the item is not applicable and please add
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 API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov-commenter]

Codecov Report

Merging #610 (998f8dd) into cosmos/v0.47.x (a724b93) will increase coverage by 0.93%.
The diff coverage is 42.00%.

@@                Coverage Diff                 @@
##           cosmos/v0.47.x     #610      +/-   ##
==================================================
+ Coverage           54.96%   55.90%   +0.93%     
==================================================
  Files                  19       20       +1     
  Lines                1479     1431      -48     
==================================================
- Hits                  813      800      -13     
+ Misses                565      536      -29     
+ Partials              101       95       -6     

[MonikaCat]

Nice! I also updated hasura metadata and added entry inside CHANGELOG.md, thanks @RiccardoM !

[MonikaCat]

tested, LGTM