CRAVEX-integration: Integrate DejaCode with business systems

[pombredanne]

It would be great to have integration with various system that CRAVEX depends on, or that can depend on CRAVEX data and features. There are a few classes of "business systems" of interest to consider like these:

• ERP to track sales of actual devices - this includes software like Tryton or Odoo
• ITSM (IT Service Management) and ITAM (IT Asset management) tools to track deployed devices and software; this could include itsm-ng (https://github.com/itsmng/itsm-ng) and snipe-it (https://github.com/snipe/snipe-it)
• "Installed base management" apps - all known tools are proprietary, so we can only expose a generic API for now

In order to enable interoperability of these different business and business-adjacent systems, we could expose and document the API to expose for these tools to push to CRAVEX, with a base example of end-to-end implementations using open source tools.

• [ ] https://github.com/aboutcode-org/dejacode/issues/342
• [ ] https://github.com/aboutcode-org/dejacode/issues/343
• [ ] https://github.com/aboutcode-org/dejacode/issues/344