Merge versatus-wasm publish functionality into LASR wallet CLI

[mattgeddes]

The process of packaging and publishing a contract is currently implemented in the versatus-wasm publish command and partially implemented in the LASR wallet CLI. We ultimately want to have all of that functionality as it is in the Versatus CLI moved into the LASR CLI. The two implementations have a lot of overlap, but one area that needs to be migrated over is the service discovery. The Versatus version uses DNS-SD and SRV records specifically, with a default name encoded, to locate one or more default IPFS nodes. This avoids the user from having to specify which IPFS node to publish to and gives a better developer experience.