Webhook / Product preferences / Invitations commands, custom scan alias patterns

[z4kn4fein]

Describe the purpose of your pull request

This PR adds the following:

• Manage webhooks command.
• Product preferences show/update commands.
• Prompt for reason argument upon flag value changes when it's required to set on the given environment.
• List/delete pending invitation commands.
• --alias-patterns option for the scan command to describe custom regex patterns for alias matching.

Related issues (only if applicable)

#23

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.