add --remote to alpha module catalog

[anoipm]

Description

Remote catalog should not be a part of the default output of the module catalog command. Instead of that, to display modules available to pull, the user should add the --remote or --remote=<URL> flag.
Command module catalog without --remote should returns result without remote modules.

$ kyma module catalog --remote

MODULE            AVAILABLE VERSIONS
cap-operator      0.20.1
docker-registry   0.10.0
registry-proxy    0.14.0

Implement it only in alpha group.

Reasons

Easier to understand by user.

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