feat(ghverify): emit event when user request verification

[Villaquiranm]

related to #2777

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• Added new tests, or not needed, or not feasible
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.10%. Comparing base (f6bd2d3) to head (a94ebe3).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2778      +/-   ##
==========================================
+ Coverage   63.08%   63.10%   +0.02%     
==========================================
  Files         563      563              
  Lines       79254    79333      +79     
==========================================
+ Hits        49998    50064      +66     
- Misses      25896    25905       +9     
- Partials     3360     3364       +4     

Flag	Coverage Δ
contribs/gnodev	60.62% <ø> (ø)
contribs/gnofaucet	14.82% <ø> (ø)
gno.land	67.56% <ø> (ø)
gnovm	67.25% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
misc/logos	19.45% <ø> (ø)
tm2	62.26% <ø> (+0.01%)	⬆️

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[thehowl]

I'm not sure this is necessary. How does this event give more information to an off-chain user, if they could just use the indexer with this query?

query {
  transactions(filter: {
    message: {
      route: vm,
      type_url: add_package,
      vm_param: {
        exec: {
          pkg_path: "gno.land/r/gnoland/ghverify",
          func: "RequestVerification"
        }
      }
  	}
  }) {
    hash
    messages {
      value {
        ... on MsgCall {
          args
        }
      }
    }
    gas_wanted
    success
    response {
      error
    }
  }
}

[leohhhn]

@thehowl

We should always practice emitting events, even if we have an indexer.

[n0izn0iz]

@thehowl if a realm (like a dao or an abstracted account) calls RequestVerification, it will be ignored by agents using your solution

[thehowl]

After the discussion in #2777, I'm OK with the event being emitted - but I still think we need to use queries as a way to get the source of truth, and use events only as a pub/sub mechanism.