Feature/sw architecture

[NejcKle]

Description

This PR introduces the key system components for the backend architecture. These include:

• Ingest Service to consume data from various sources (TTN and general HTTP currently supported, mock devices/applications are found in mock directory)
• Processor Service to consume the Kafka message queue and store data dynamically into the database
• REST API to expose sensor, application info as well as sensor measurements

Closes #1

Areas of interest for the reviewer

Please review the code in the following order:

1. docker-compose file and the system architecture from the docs folder
2. Ingest Service
3. Mock device
4. Processor Service
5. REST API

After reviewing you can test the application if you wish to do so, this is not necessary.

Checklist

• My code follows the style guidelines as defined by IRNAS.
• I have performed a self-review of my code.
• My changes generate no new warnings.
• I added/updated source code documentation for all newly added or changed functions.
• I updated all customer-facing technical documentation.

After-review steps

• I will merge PR by myself.

[vid553]

In general looks good, but some improvements are needed.
I've mostly pointed out missing docstrings and other comments, but there are also some code change suggestions and questions.
You should also add documentation (installation and usage).

As I have made a review per commits, there may be some outdated commend left. I went through all the files from all commits again and cleaned them, but it's possible I've missed some.

I have also tested the code locally by running the containers. I have not tested services that are currently not containers.

[vid553]

Mention that this applies for developing, but for prod, the docker compose should be used.

[vid553]

• consider adding some exception handling, at least for database operations
• consider adding pagination or at least limit the number of results returned