fix(mkpkglists): improve package meta archive

The SQL logic in this file for package metadata now exactly
reflects RPC's search logic, without searching for specific
packages.

Two command line arguments are available:

    --extended | Include License, Keywords, Groups, relations
                 and dependencies.

When --extended is passed, the script will create a
packages-meta-ext-v1.json.gz, configured via packagesmetaextfile.

Archive JSON is in the following format: line-separated package objects
enclosed in a list:

    [
    {...},
    {...},
    {...}
    ]

Signed-off-by: Kevin Morris <kevr@0cost.org>