Estimate annual staking rewards rate

[brentstone]

Describe your changes

Closes #3817

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
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies: PoS Queries namada-docs#394
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

Attention: Patch coverage is 94.05941% with 6 lines in your changes missing coverage. Please review.

Project coverage is 72.80%. Comparing base (f7830f6) to head (8c4e722).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/sdk/src/rpc.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3816      +/-   ##
==========================================
+ Coverage   72.78%   72.80%   +0.02%     
==========================================
  Files         338      338              
  Lines      103923   103995      +72     
==========================================
+ Hits        75637    75711      +74     
+ Misses      28286    28284       -2     

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[mergify]

Hey @brentstone, your pull request has been dequeued due to the following reason: PR_DEQUEUED.
Sorry about that, but you can requeue the PR by using @mergifyio requeue if you think this was a mistake.