v8.0.0-alpha.1

• Ketting requires Node 16 now.
• No longer using node-fetch, as fetch() is natively supported on Node 18. If you are using Ketting with Node 16, you should install node-fetch or run node with the --experimental-fetch option.
• Upgraded OAuth2 dependency to [@badgateway/oauth2-client][8].
• Submitting actions with missing required fields will now throw an exception.
• Actions that have pre-filled values will auto submit those values unless they are explicitly overridden.
• #459: Now uses the correct spelling of 'placeholder' in HAL forms (@dayre).
• Export the FetchMiddleware type.
• #444: Allow multiple query parameters to be set with the same key when specifying template variables. (@qmachard)
• Upgrade to Typescript 5