Add support for Forc (Fuel Orchestrator)

[crodas]

Adds a completion spec for forc CLI

[withfig-bot]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[withfig-bot]

Hello @crodas,
thank you very much for creating a Pull Request!
Here is a small checklist to get this PR merged as quickly as possible:

• Do all subcommands / options which take arguments include the args property (args: {})?
• Are all options modular? E.g. -a -u -x instead of -aux
• Have all other checks passed?

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[crodas]

I have read the CLA Document and I hereby sign the CLA