Closes #85 - Extend support contract assignments to modules

[mathieued]

Closes #85 to extend the Support Contract Assignment feature to Modules.

Please note that, as License Assignments are available only for Devices, I've made the assumption that if a Module is selected/assigned in a Support Contract Assignment, neither a Device nor a License Assignment can be selected/assigned to the same one.

Let me know if you agree with that assumption, I can update if you don't.

[mathieued]

Hello !

@DanSheps or any of the allowed reviewers, is there any chance to have the awaiting PRs reviewed soon ?

Just asking to anticipate. Thanks, and have a good day!