text: Title: Where is function browserContext.overridePermissions(origin, permissions)?
  Body: I need to get the read and write permissions of the **clipboard**, but in the headless mode, I can only use this function to increase the permissions. The test is valid in puppeteer, but there is no such function in pyppeteer. I looked at the source code and the principle of pyppeteer looks like It's CDP, I don't know if this function can be implemented?
  
  https://pptr.dev/#?product=Puppeteer&version=master&show=api-browsercontextoverridepermissionsorigin-permissions
  
  If it can be achieved, may you add **browserContext.overridePermissions(origin, permissions)**? Thanks a lot!
  