feat: use files for dynamically generating the manifest and tracking state`

[traviscrist]

• Change the Codius CLI completely to not use level db and to use the concept of a state file per pod being uploaded to codius.
• Uses the files: codius.json (required), codiusvars.json (required), and codiushosts.json to generate the manifest for upload to the codius hosts
• Stores information about how the upload went in a *.codiusstate.json file which is then used by the extend command to extend the contract. This includes the manifest and the hosts used for the upload.
• Support extending manifest by hash + host with extend-hash command
• Supports using a custom lists of hosts via the codiushosts.json file.
• Improves debugging by surfacing any error thrown via riverpig to the user.
• Runs host discovery, price fetch checking, and upload in parallel.
• Document changes in the README Resolves issues: #46 #45 #40 #39 #34 #32 #27 #12 #1