`download`: CSV/TSV aware download command

[jqnatividad]

The download command will be CSV/TSV aware in that:

• you can download the first n --sample records
• and for servers that support Range Requests, be able to specify an offset (in MB) before downloading the following n --sample records, sniffing the head of the CSV first to determine the CSV schema
• take advantage of the same Range Request server support typically used for resumable downloads, to get new records that have been appended to a remote CSV file, downloading only the new records and appending it to the local copy.
• be able to download multiple files (using http2 and brotli/gzip/deflate compression if the server supports it) using a glob pattern if a web server supports directory listing
• support http, https, ftp, sftp & s3 url schemes

[jqnatividad]

• also add --random sampling option if the server supports Range Requests

[github-actions[bot]]

Stale issue message

[jqnatividad]

also add support for "ckan://" scheme

[github-actions[bot]]

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