Add `register` command

[jqnatividad]

The register command registers a CSV table into the local qsv registry.

The registry enables:

• easy reference in other qsv command to CSVs/TSVs by their assigned alias/es for both CSV name and column names.
• the metadata of the registered CSVs are precomputed (stats, frequency, schema) and persisted in the registry, enabling lookups not only against the CSV data, but also against its metadata
• the enrich command (see #487 )

Registering a CSV will use the package (see #486 ) command to populate the registry. The registry database is TBD (sqlite?, UnQLite? Sled? turingdb?)

The qsv registry store will be interoperable with CKAN - i.e. qsv can fetch data/metadata from a CKAN catalog and upload registered packages to CKAN.

[github-actions[bot]]

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[jqnatividad]

Revisiting the register command.

It will now:

• upload the CSV to a designated CKAN site or to datHere's central registry if the user does not have a CKAN site
• upon upload, the CSV is added to the Datastore with DP+ and all the metadata is prepopulated. A zipsigned compressed file is also stored to facilitate easy, quick and secure retrieval from any computer by the owner and approved users/collaborators
• it will now have a Datastore API and is available for remote API queries - both traditional API and qsvAPI (qsv Answering People Interface 😄 ) queries with the ask and sqlp commands
• assign a qsvid to the CSV. qsvid is a UUID - the URL to the registry entry
• create a checksum for the CSV and add it to the registry entry
• add a comment to the first line of the CSV with some registry metadata ("#" followed by qsvid, version no, last updated, created, num rows, num columns, etc.)

[github-actions[bot]]

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