[SDK] Add ObservedData to models

[throuxel]

Use case

See docs (4.14 ObservedData)

Current Workaround

Proposed Solution

Additional Information

Would you be willing to submit a PR?

We strongly encourage you to submit a PR if you want and whenever you want. If your issue concern a "Community-support" connector, your PR will probably be accepted after some review. If the connector is "Partner-support" or "Filigran-support", a dev team make take over but will base its work on your PR, speeding the process. It will be much appreciated.