Switch to a SQL storage backend

[dopey]

Currently step-ca uses a NoSQL storage schema.

Switching to a SQL schema will have numerous benefits:

• Allow users to easily query the db to build their own reporting.
• Allow real time queries where indexes are currently necessary (acme_account_orders_index, etc.)

[dopey]

Hey, circling back on this issue - we've released certificate observability (visibility, alerting, monitoring) as part of our hosted product. You can "link" an open source CA to the hosted product and start seeing new certificates in the UI.

Linking a single open source CA is free. Sign up here: https://info.smallstep.com/certificate-manager-early-access-mvp/, and follow the directions to link an existing CA. Encourage anyone looking to get visibility into their step-ca PKI to try this out and give us feedback. cheers!

Note: you'll need to recreate your provisioners using the new step beta ca provisioner subcommand group. Let us know if you're having any issues there and we'll be happy to help. For real time help, come find us on Discord - https://discord.gg/ypu2T7qg9y.