[Packager] Add Controllers support

Design

From @quentin

User story

The animator animated some rigs in Maya and wants to export the a few controller animation for lighting or compositing so they can parent things to them

Expected result

• A null per controller with animation baked In both case this should be an FBX with the proper frame range and that should be readable by Modo and Nuke

Scenario

• Animator selects asset to export
• Bip knows if it should export some controllers from this asset (listed in the project manager)
• Bip export the FBX
• In Modo we can import the animated locator or apply the animation to locators with the right name using the scene manager (import to be designed)
• In Nuke we can import the FBX using nuke tool

Tasks

• Implement controller exporter in Packager
• Add controllers content type support to the Package Manager (ingestion)
• Add "Export controller" metadata (bool + list of names)

See #19 (closed) for complete design