New: options-in-versions

Hello!

I'm about to introduce a new document for curl named "options-in-versions",
which is exactly what it sounds like: it lists all command line options
showing the exact curl version in which they were introduced.

The idea is that is will help users figure out which options that are likely
to work when targetting particular versions, and more.

The file format is very simple: the long option format, the short within
parenthesis if any and then the version number. The list is sorted
alphabetically on the long name.

    --long (-l) 1.2.3

Together with the document there's also a new test (971) that verifies that
the complete list of options is identical ot the complete list of options in
docs/cmdline-opts to make sure it stays in sync and is up-to-date going
forward.

Should land within soon.

The PR => https://github.com/curl/curl/pull/5372

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