gst-full: add 'gst-full-' features options

gst-full: add 'gst-full-' features options

These options allow to select a set of features from a given
plugin with the following syntax:

-Dgst-full-plugins=plugin1;plugin10
-Dgst-full-elements=plugin2:element1,element2
-Dgst-full-typefind-functions=plugins3:func
-Dgst-full-device-providers=plugin4,dp1
-Dgst-full-dynamic-types=plugin5:dt1

By default all the enabled plugin are registered and
gst-full-plugins will allow to include only a set of plugin

If a feature(element, typefind etc.) is selected from a plugin,
the plugin is removed from the plugins list.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199>