Implement Prometheus exporter

[No767]

Summary

Implements Prometheus metrics through prometheus-fastapi-instrumentator. This is the final general feature for Kanae, as
it was asked for me to implement metrics for data collection. This PR only adds basic HTTP metrics, such as response size and the amount of requests made. This does not include metrics directly from Kanae; only the default HTTP metrics. This PR fully completes all general features for Kanae, as this feature was asked by previous leadership to implement.

There are some notable changes compared to previous versions in this PR. Namely:

• Metrics are exposed on the same server as all operations. Thus, the endpoint becomes 127.0.0.1:8000/metrics, not 127.0.0.1:9555/metrics as envisioned
• Added deploy/launcher.sh in order to reliably allow the Prometheus client library to manage multiprocess collection
• Ensure that all .sh files have their EOL set to LF instead of automatically choosing

Types of changes

What types of changes does your code introduce to Kanae?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (Updates to README.md, the documentation, etc)
• Other (if none of the other choices apply)

Checklist

Put an x in the boxes that apply

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes. (if appropriate)
• All workflows pass with my new changes
• This PR does not address a duplicate issue or PR

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
1 Accepted issue

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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