[pos] Add epoch argument to vp::pos::rewards

[tzemanovic]

Describe your changes

• re-opened from [pos] Add epoch argument to vp::pos::rewards #4196 to workaround a CI issue with external PRs

This adds an epoch argument to the rewards() function in vp::pos. It does require a RPC node update in order to work, but it's backwards compatible. Tested with previous build of namadan and results are same as before:

With node on main and client on this branch:

$ ./target/debug/namadac rewards --source tnam1qrtypl0yazfamk8ptmgp608msl8wzrkpmqwppc7w --validator tnam1qxsx2ezu89gx252kwwluqp7hadyp285tkczhaqg0
Current rewards available for claim: 4625.955882 NAM

With both client and node on this branch:

$ ./target/debug/namadac rewards --source tnam1qrtypl0yazfamk8ptmgp608msl8wzrkpmqwppc7w --validator tnam1qxsx2ezu89gx252kwwluqp7hadyp285tkczhaqg0
Current rewards available for claim: 4625.955882 NAM

$ ./target/debug/namadac rewards --source tnam1qrtypl0yazfamk8ptmgp608msl8wzrkpmqwppc7w --validator tnam1qxsx2ezu89gx252kwwluqp7hadyp285tkczhaqg0 --epoch 60
Rewards for epoch 60: 4625.955882 NAM

$ ./target/debug/namadac rewards --source tnam1qrtypl0yazfamk8ptmgp608msl8wzrkpmqwppc7w --validator tnam1qxsx2ezu89gx252kwwluqp7hadyp285tkczhaqg0 --epoch 59
Rewards for epoch 59: 3887.536527 NAM

$ ./target/debug/namadac rewards --source tnam1qrtypl0yazfamk8ptmgp608msl8wzrkpmqwppc7w --validator tnam1qxsx2ezu89gx252kwwluqp7hadyp285tkczhaqg0 --epoch 58
Rewards for epoch 58: 3148.755426 NAM

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:
• 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:

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #4196. Mergify cannot evaluate rules on this PR. ⚠️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.18%. Comparing base (80223b3) to head (3a0b4be).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4297      +/-   ##
==========================================
+ Coverage   74.02%   74.18%   +0.16%     
==========================================
  Files         345      345              
  Lines      109920   110565     +645     
==========================================
+ Hits        81367    82024     +657     
+ Misses      28553    28541      -12     

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #4196. Mergify cannot evaluate rules on this PR. ⚠️