feat: For each account, query if it was used to add a package

[jefft0]

The following GraphQL query gets the packages added by an account address (creator):

query {
  getTransactions(
    where: {
      messages: { value: { MsgAddPackage: {creator: { eq: "g1juz2yxmdsa6audkp6ep9vfv80c8p5u76e03vvh"}}}}
      success: { eq: true }
    }
  ) { messages { value { ... on MsgAddPackage { package{name}}}}}
}

If there are no matches, the result is:

{
  "data": {
    "getTransactions": null
  }
}

If there is a match, the result is something like:

{
  "data": {
    "getTransactions": [
      {
        "messages": [
          {
            "value": {
              "package": {
                "name": "deep2"
              }
            }
          }
        ]
      }
    ]
  }
}

The following code uses this to query txIndexerRemote for the packages added by address:

  const txIndexerRemote = "https://txindexer.gno.berty.io/graphql/query"
  const address = "g1juz2yxmdsa6audkp6ep9vfv80c8p5u76e03vvh"
  const requestOptions = {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({
      'query': `query { getTransactions(where: { messages: { value: { MsgAddPackage: {creator: { eq: "${address}"}}}} success: { eq: true }}) { messages { value { ... on MsgAddPackage { package{name}}}}}}`
    }),
  }
  const response = await fetch(txIndexerRemote, requestOptions)
  const result = await response.json()

If there are no packages, result.data.getTransactions is null. Otherwise result.data.getTransactions is something like:

[{"messages":[{"value":{"package":{"name":"mypackage"}}}]}]