Adds flags to skip prompting of WebAuthn install for headless commands

[cannikin]

When generating a test project with yarn build:test-project the setup and generate commands for dbAuth were getting stuck because there is an interactive prompt asking the user if they want to install WebAuthn support. This PR adds a flag --webauthn and --no-webauthn to skip the prompt.

This PR also makes the base64url import a devDependency in the api package and then adds it as a regular dependency if/when you setup dbAuth, adding it to the app's package.json.

NOTE At this time there's still a weird dependency error where it appears the CLI is somehow importing something that imports base64url. Building the test project I see this error when it gets to the yarn rw g secret step: @dac09 and @jtoar believe this was fixed by rebuilding the test project fixture.

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