This PR replaces [goomy](https://github.com/ethpandaops/goomy-blob) with
[spamoor](https://github.com/ethpandaops/spamoor).

The spamoor project is based on goomy, but was improved a lot to handle
high transaction throughput reliably.
It supports all features that goomy provides, but blob scenarios are
prefixed with `blob-`.

As spamoor works much better by now, it makes sense to deprecate goomy
and replace it with spamoor.