Have KeyBase publish itself as a public KeyServer

It would be an important step in KeyBase adoption IMO, for it to publish itself as a valid keyserver using the standard protocols for such.

As it stands, since keybase doesn't, it means that all the tooling (such as EnigMail for Thunderbird) that has existed for a decade+ ... is unusable against keybase published keys.

The issue requests that KeyBase publish itself as a public keyserver using standard protocols, so tools such as EnigMail for Thunderbird can use KeyBase-published keys. No files, tests, or entry points are named; first identify the relevant keyserver and protocol integration points. Done means external tooling can consume published KeyBase keys.

Written by the indexing model from the issue text.