[Bccorb]

What

• seamless clients get shows PKCE: required | not required and nonce: required | not required.
• seamless clients create and update accept --pkce/--no-pkce and --nonce/--no-nonce. The shared @seamless-auth/types schema checks the API's rules before the request is sent: PKCE can be turned off only on a confidential client, and the nonce only once PKCE is off.
• An application with both off gets a warning on get, create and update. In list its row is marked no PKCE or nonce, followed by a count. Such a client relies only on state and client authentication against authorization code injection.
• Pins @seamless-auth/types 0.34.0-next.4, where both fields are required in application responses.
• Help text and a minor changeset.

Closes #337

Checks

• npm run build: passes
• npm test: 1718 passed, 4 skipped
• npm run coverage: statements 99.05%, branches 96.72%, functions 98.69%, lines 99.32%