python3-picamera2: add Picamera2 library #1424
                
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- What I did
Added python3-picamera2 recipe. Picamera2, https://github.com/raspberrypi/picamera2, is the libcamera based replacement for picamera, which used the legacy precompiled camera stack.
This was also recommended by @kraj in #1298 (comment)
- How I did it
TODO: