libcamera: ipa_manager: implement class for managing IPA modules

IPAManager is a class that will search in given directories for IPA
modules, and will load them into a list. It also provides an interface
for pipeline handlers to acquire an IPA.

A meson build file for the IPAs is added, which also specifies a
hard-coded path for where to load the IPAs from in the installation
directory. More paths can be specified with the environment variable
LIBCAMERA_IPA_MODULE_PATH, with the same syntax as the regular PATH
environment variable. Make the test framework set this environment
variable.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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