libcamera: Introduce YamlParser as a helper to parse yaml files

Introduce YamlParser as a helper to convert contents of a yaml file to
a tree based structure for easier reading, and to avoid writing parser
with raw yaml tokens. The class is based on libyaml, and only support
reading but not writing a yaml file.

The interface is inspired by Json::Value class from jsoncpp:
http://jsoncpp.sourceforge.net/class_json_1_1_value.html

Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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