feat: duration renderer for SIGN_MODE_TEXTUAL

[JimLarson]

Description

Closes: #12710

Adds SIGN_MODE_TEXTUAL value renderer for google.protobuf.Duration messages.

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Author Checklist

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I have...

• [X] included the correct type prefix in the PR title
• [X] added ! to the type prefix if API or client breaking change
• [X] targeted the correct branch (see PR Targeting)
• [X] provided a link to the relevant issue or specification
• [X] followed the guidelines for building modules
• [X] included the necessary unit and integration tests
• [ ] added a changelog entry to CHANGELOG.md
• [X] included comments for documenting Go code
• [X] updated the relevant documentation or specification
• [X] reviewed "Files changed" and left comments if necessary
• [ ] confirmed all CI checks have passed

(CHANGELOG intentionally unmodified - will be updated with the whole epic)

Reviewers Checklist

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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)

[amaury1093]

This branch is out-of-date with the base branch

@JimLarson Could you rebase/merge main, or give maintainers write access to your branch so that we can do it for you?

[JimLarson]

@amaurym or @julienrbrt please reenable the automerge. Thanks!

[codecov[bot]]

Codecov Report

Merging #13312 (08731fe) into main (6d03dde) will decrease coverage by 0.08%. The diff coverage is 78.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13312      +/-   ##
==========================================
- Coverage   54.05%   53.97%   -0.09%     
==========================================
  Files         653      648       -5     
  Lines       55899    55425     -474     
==========================================
- Hits        30216    29915     -301     
+ Misses      23269    23111     -158     
+ Partials     2414     2399      -15     

Impacted Files	Coverage Δ
tx/textual/valuerenderer/duration.go	78.40% <78.40%> (ø)
tx/textual/valuerenderer/valuerenderer.go	79.59% <100.00%> (ø)
x/staking/simulation/operations.go	74.54% <0.00%> (-1.38%)	:arrow_down:
x/group/keeper/keeper.go	56.25% <0.00%> (-0.40%)	:arrow_down:
cosmovisor/cmd/cosmovisor/help.go
cosmovisor/cmd/cosmovisor/run.go
cosmovisor/logger.go
cosmovisor/errors/multi.go
cosmovisor/cmd/cosmovisor/version.go
cosmovisor/cmd/cosmovisor/main.go
... and 12 more