Check length of validator name in metadata

[brentstone]

Describe your changes

When we added name, forgot to include a check on the string length

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 15 lines in your changes missing coverage. Please review.

Project coverage is 72.68%. Comparing base (59fdda8) to head (46eb69b).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/sdk/src/tx.rs	33.33%	8 Missing ⚠️
crates/apps_lib/src/config/genesis/transactions.rs	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3779      +/-   ##
==========================================
- Coverage   72.69%   72.68%   -0.02%     
==========================================
  Files         338      338              
  Lines      104324   104345      +21     
==========================================
  Hits        75839    75839              
- Misses      28485    28506      +21     

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