fix: Evidence API does not decode the hash properly

[likhita-809]

Description

Closes: #13444

This PR fixes the x/evidence api query which is not decoding the evidence hash properly because of its type ([]byte). We fix it with the following steps:

1. Adds a new proto field hash of type string
2. Make the old evidence_hash field deprecated
3. Updates query handler

---

Author Checklist

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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

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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)

[codecov]

Codecov Report

Merging #13740 (65c1942) into main (a51aa51) will increase coverage by 0.16%.
The diff coverage is 45.45%.

❗ Current head 65c1942 differs from pull request most recent head 85e80fd. Consider uploading reports for the commit 85e80fd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13740      +/-   ##
==========================================
+ Coverage   55.87%   56.03%   +0.16%     
==========================================
  Files         656      646      -10     
  Lines       57164    55790    -1374     
==========================================
- Hits        31941    31264     -677     
+ Misses      22643    21984     -659     
+ Partials     2580     2542      -38     

Impacted Files	Coverage Δ
x/evidence/keeper/keeper.go	84.88% <ø> (ø)
x/evidence/types/querier.go	0.00% <0.00%> (ø)
x/evidence/keeper/grpc_query.go	47.36% <50.00%> (-1.69%)	⬇️
x/evidence/client/cli/query.go	79.31% <100.00%> (+3.50%)	⬆️
x/staking/simulation/operations.go	74.54% <0.00%> (-1.38%)	⬇️
simapp/state.go
simapp/upgrades.go
simapp/genesis.go
simapp/simd/cmd/genaccounts.go
simapp/simd/cmd/testnet.go
... and 7 more

[alexanderbez]

This looks good so far!

[alexanderbez]

LGTM. Be sure to add a changelog

[atheeshp]

lgtm, pending changelog.

[julienrbrt]

lgtm, +1 for the changelog