Add ability to export and import locally downloaded models

[rsriniva]

Feature request description

It would be good to add an export and import flag to RL so that locally downloaded model files and other settings can be exported to a compressed, checksummed file and re-imported on another machine to avoid the need to re-download model files, some of which are multi-gigabyte downloads

Suggest potential solution

Perhaps ramalama --export-models <tar.gz or xz> file and then similarly ramalama --import-models

Have you considered any alternatives?

Yes. manually compress and uncompress the .local/share/ramalama folder and copy it over to another machine.

Additional context

Getting a new laptop. Was wondering how to copy downloaded models without the need to re-download the models all over again on the new machine

[github-actions]

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