142 mark messages received by gateway

[latin-panda]

Description

This PR will set the SMS status as Needs Forwarding when updating statuses or when saving new SMS to Gateway DB. Then Gateway will notify the status change to API from the beginning, reducing the chance of API to resend the same SMS.

This PR is dependant of this one: https://github.com/medic/medic-gateway/pull/159

To AT: My test device at the moment is Android 9. Can you please test this in older Android version? Thanks!

https://github.com/medic/medic-gateway/issues/142

Code review items

• Readable: Concise, well named, follows the style guide, documented if necessary.
• Documented: Configuration and user documentation on medic-docs
• Tested: Unit and/or e2e where appropriate
• Internationalised: All user facing text
• Backwards compatible: Works with existing data and configuration or includes a migration. Any breaking changes documented in Changes.md.

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[latin-panda]

Hi @dianabarsan 👻 Could you please take a look at this one? It's 2 commits from the previous PR. I took a look at the docs, I feel it doesn't need changes.