libcamera: Add initial logger

The logger is based on the ostream API, allowing code to log messages in
a native way. It automatically logs the time stamp, severity level, file
name and line number.

Many important features are missing, such as logging to file, logging
classes, and log filtering based on the severity level, file name and
class.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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