Add support for CLI-based MFA recovery

[nmanoogian]

This PR adds a CLI command which simply calls POST /v3/me/mfa_recovery.

This depends on https://github.com/DopplerHQ/server/pull/6727

[apazzolini]

Will defer to your judgment on the comment.

[apazzolini]

Should we make the command doppler mfa recovery for more symmetry with the other options? (And in case we want to do other things with mfa in the future, e.g. allow the CLI to itself be an mfa option).

[Piccirello]

You could also potentially nest it under doppler login (i.e. doppler login mfa-recovery).

[nmanoogian]

I like both of these options! I'll go with doppler mfa recovery as I like the idea of having more MFA commands in the future

[nmanoogian]

We're seeing an issue with our Windows install.sh test in that the response code of the download request is coming back "000" with an error code from curl. It's pretty easy to test with:

curl --tlsv1.2 --proto "=https" -w "%{http_code}" --silent --retry 5 -o "binary" -LN -D - "https://cli.doppler.com/download?os=windows&arch=amd64&format=zip" 2>&1

Thanks to @watsonian for finding this issue: curl/curl#13845 which appears to be the same problem.

I've removed the Windows test as a required check for now and I'll monitor the curl issue for updates.