Enrich credentials, kinds, and definition of uniqueness

[oubiwann]

Add:

• [x] Name (required for Kind::Account, Kind::ServiceCredentials, Kind::Asymmetric, and Kind::Certificates)
• [x] Account ID (only for Kind::Account)
• [x] Key (e.g, API Key; only for Kind::ServiceCredentials)
• [x] Secret (e.g., API Secret; only for Kind::ServiceCredentials)
• [x] Public Key (only for Kind::Asymmetric)
• [x] Private Key (only for Kind::Asymmetric)
• [x] Public Cert (only for Kind::Certificates)
• [x] Private Cert (only for Kind::Certificates)
• [x] Root Cert (only for Kind::Certificates)

Also update Kind to include:

• [x] Certificates
• [x] Asymmetric (public/private keys)
• [x] Service Credentials

Distinguish between username/password and account/username/password:

• [x] Define Password for the former
• [x] Define Account for the latter (migrate old ones to Password)
• [x] Remove Credentials (migrate old ones to Password)

Add migrations for these:

• [x] Certs
• [x] Kind
• [x] All the bits that depend on those

Update ID to reflect these changes, allowing for similar secrets to exist (e.g., same user, same URL, but different company, etc.):

• [x] Add a default for Metadata.category
• [x] Migration for category will be the default value
• [x] Add migration for name to be the same as username from previous version of record
• [x] Update code for Kind::Password types' CRUD ops to copy username field to name field
• [x] Change ID to be a concatenation of kind:category:name:url

Flag updates for CRUD, listing, and export operations:

• [x] Add --kind flag (default being password)
• [x] Add --category flag (edits, listing, export/import)
• [ ] Change --username flag for edits to --name
• [ ] Add an alert when updating records with no URL (show existing data, ask to confirm overwrite)

Cleanup:

• [x] Rename various "account variables to "record" (unless they specifically refer to the account type)
• [x] Rename Creds to Secrets

[oubiwann]

Calling this done.