ddb.ResolveTag latency results in timeouts on DoltHub

[coffeegoddd]

ddb.ResolveTag is slow for DoltHub databases with a large number of tags.

Latency appears to come from:

ds, err := ddb.db.GetDataset(ctx, tagRef.String())
if err != nil {
  return nil, ErrTagNotFound
}

dc, err := datas.LoadCommitAddr(ctx, vrw, commitAddr)
if err != nil {
  return nil, err
}

commit, err := NewCommit(ctx, vrw, ns, dc)
if err != nil {
  return nil, err
}

each of which can have variable latency from 300-700ms.