Add OpenTelemetry instrumentation

[ldhenry]

This PR adds Otel Instrumentation with an OpenTelemetry Collector configured to export traces to LaunchDarkly for Release Guardian.

To get this to work you'll need to do the following:

1. Create a new Access Token in LD with writer permissions. Save it as LD_ACCESS_TOKEN in your .env.local file
2. Run the collector in a new terminal with docker compose up
3. Start the app as usual
4. Create new LD metrics with event keys outlined in the updated README.md

You can view traces in Jaeger locally at http://localhost:16686. They should be enriched with flag evaluation events (aka logs):

Here is a screenshot of it in action: