feat: add QGB query attestation CLI command

[rach-id]

Overview

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[rootulp]

Overall code LGTM but I think it would be beneficial if this PR contains tests that verify the new feature. I attempted to use it via $ ./scripts/single-node.sh:

$ ./build/celestia-appd query qgb attestation 1 | jq
{
  "nonce": 1,
  "members": [
    {
      "power": 4294967296,
      "evm_address": "0x966e6f22781EF6a6A82BBB4DB3df8E225DfD9488"
    }
  ],
  "height": 1,
  "time": "2023-06-07T19:50:41.120241Z"
}
$ ./build/celestia-appd query qgb attestation 2 | jq
Error: rpc error: code = Unknown desc = attestation not found: unknown request

Questions:

1. How would I verify that attestation 2+ work? Do I need to run something else to get more attestations added to state
2. Is that error expected for an attestation that doesn't exist yet?

[rach-id]

How would I verify that attestation 2+ work? Do I need to run something else to get more attestations added to state
Is that error expected for an attestation that doesn't exist yet?

At chain start, there is only 1 attestation. And after 400 blocks, you will see another one.

For the tests, I will check if I can write something. The thing is it's just calling a query, it's not doing anything fancy. Thus, I thought that testing it would only be testing if cobra works well, then if the query works fine (and that's already tested in the keepers)

Edit: added test

[codecov-commenter]

Codecov Report

Merging #1892 (67ff49e) into main (376a1d4) will decrease coverage by 0.63%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1892      +/-   ##
==========================================
- Coverage   21.85%   21.22%   -0.63%     
==========================================
  Files         117      120       +3     
  Lines       13304    13696     +392     
==========================================
  Hits         2907     2907              
- Misses      10107    10499     +392     
  Partials      290      290              

Impacted Files	Coverage Δ
x/qgb/client/query.go	0.00% <0.00%> (ø)
x/qgb/keeper/query_attestation.go	0.00% <0.00%> (ø)
x/qgb/module.go	7.27% <0.00%> (ø)

... and 2 files with indirect coverage changes

[rootulp]

Thanks for adding the test! LGTM. I'm not sure if you saw this:

Is that error expected for an attestation that doesn't exist yet?

[rach-id]

Yes. I updated the error message to have a clearer message