feat: adds allow-list commands

[jamessimone]

What does this PR do?

Adds commands for interacting with the allow-list, including the creation of the allow-list if it doesn't already exist. My team realized recently that we were creating our allow-list on the wrong path in CI, leading to some confusion and some duplicated --no-prompt or echo y | sf plugins install ... commands over the years.

I also added mocha properly to the tsconfig.json file, as without that, VS Code will lint the mocha global usage in tests as an error.

[jshackell-sfdc]

I'm the CLI writer. The --help looks great! But I added a few suggestions, let me know if you have any questions.

[jamessimone]

@jshackell-sfdc thanks so much for your review. I've updated with your feedback - however, in thinking about the changes to --help, I'm left wondering if I shouldn't also update the command itself to be known as allowlist versus what I currently have it authored as (allow-list). What do you think?

[jshackell-sfdc]

Yes, we actually talked about this in standup today! I think @mitchspano was going to comment about the topic name (I think he liked allowlist rather than allow-list) but until he weighs in, I agree - allowlist is preferred from my POV. Thank you!

(and in this context, allowlist is the topic name. :) )

[jamessimone]

@jshackell-sfdc I spoke with Mitch and we aligned on allowlist so I made those updates and pushed them up!