Add support for Google Keep #159

I was chatting to Gemini the other day and I asked it to store some data. It stored it in Google Keep.

It would be good extract this information.

It may be worth adding a KeepService.ts but it may require more OAuth scopes https://developers.google.com/workspace/keep/api/reference/rest

See:

• https://developers.google.com/workspace/keep
• https://developers.google.com/workspace/keep/api/reference/rest
• https://github.com/kiwiz/gkeepapi