Fix camera proxy to not require api_password to function

[PhracturedBlue]

Description:

Enables camera.proxy to directly communicate with the proxied camera rather than using a URL. This enables the camera proxy to work without setting http.password_api

Related issue (if applicable): fixes #16402

Note that while this works fine, it does not directly consume the mjpeg stream from the proxied camera due to issues documented in #16402. Instead it relies on building the mjpeg from individual frames of the proxied camera.

This pull request is also related to #15376

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

[balloob]

I know we've been jumping around in what the correct solution is here. Only recently did we make the image available for other components in this fashion. For streaming it is a lot more difficult as one needs to know how the stream is implemented to be able to iterate over it. So for now converting it to a stream ourselves is probably better, until we have time to fix camera plumbing once and for all (but I don't know how that would look)

[pvizeli]

Maybe like the image for cameras with generic token they change all 5min with url?