Add command to configure sequra from command line

[m1k3lm]

What is the goal?

Have a way to setup seQura minimun configuration using CLI

How is it being implemented?

Created a Symfony Console command

bin/magento sequra:configure --merchant_ref="${SQ_MERCHANT_REF}" \
    --username="${SQ_USER_NAME}" \
    --assets_key="${SQ_ASSETS_KEY}" \
    --endpoint="${SQ_ENDPOINT}" \
    --password="${SQ_USER_SECRET}"

Opportunistic refactorings

Changed version number to X.Y.Z format required by Adobe App Store

Caveats

Does it affect (changes or update) any sensitive data?

No

How is it tested?

Manual tests

How is it going to be deployed?

Standard deployment

[mescalantea]

LGTM