Adds some pending bindings for maliput plugin module.

[francocipollone]

🎉 New feature

Summary

• Adds bindings for the MaliputPluginType enum
• Adds bindings for the MaliputPlugin::Id class
• Adds tests

Test It

import maliput
maliput.plugin.MaliputPluginManager().ListPlugins()

{
 maliput_osm: MaliputPluginType.kRoadNetworkLoader,
 maliput_dragway: MaliputPluginType.kRoadNetworkLoader,
 maliput_multilane: MaliputPluginType.kRoadNetworkLoader,
 maliput_malidrive: MaliputPluginType.kRoadNetworkLoader
}

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if it affects the public API)

[agalbachicar]

LGTM