feat(prover): improve /status API

[davidtaikocha]

Those two fields will be used by the new guardian prover dashboard.

[codecov]

Codecov Report

Merging #444 (ebd7d5c) into main (02c981d) will decrease coverage by 0.06%.
Report is 2 commits behind head on main.
The diff coverage is 71.42%.

❗ Current head ebd7d5c differs from pull request most recent head b8e409f. Consider uploading reports for the commit b8e409f to get more accurate results

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
- Coverage   61.27%   61.22%   -0.06%     
==========================================
  Files          44       44              
  Lines        5113     5114       +1     
==========================================
- Hits         3133     3131       -2     
- Misses       1671     1673       +2     
- Partials      309      310       +1     

Files	Coverage Δ
driver/state/state.go	61.97% <100.00%> (ø)
pkg/rpc/client.go	50.41% <100.00%> (ø)
pkg/rpc/utils.go	25.72% <100.00%> (ø)
proposer/config.go	96.25% <ø> (-0.23%)	⬇️
prover/proof_submitter/transaction/sender.go	44.26% <100.00%> (ø)
pkg/rpc/methods.go	45.86% <80.00%> (ø)
prover/prover.go	52.96% <80.00%> (ø)
driver/driver.go	59.17% <0.00%> (ø)
prover/server/api.go	43.13% <50.00%> (+0.42%)	⬆️

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