feat: added setup for production observability (metrics via OTEL)

[sheensantoscapadngan]

Description 📣

This PR adds setup for prod observability with the following components:

• Open Telemetry (for instrumentation and gathering of application traces and metrics)
• Open Telemetry collector (for batching of telemetry data from application servers and for exposing data for long-term storage)
• Prometheus (for storage of metrics in time-series format)
• Grafana (for visualization of time-series data from Prometheus)

Type ✨

• Bug fix
• New feature
• Breaking change
• Documentation

Tests 🛠️

# Here's some code block to paste some code snippets

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GitGuardian id	GitGuardian status	Secret	Commit	Filename
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9387833	Triggered	Generic Password	fc3a409	prometheus.yml	View secret

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[maidul98]

Curious: what is the impact of such metric collection on the API? Does it increase our API response times much?

[maidul98]

Good setup, left some questions and comments