RFE: Add support for OpenTelemetry metrics and tracing

Description

This RFE (Request for Enhancement) is to add the ability for codecarbon to allow collection of OpenTelemetry traces and correlation with codecarbon metrics. See
https://opentelemetry.io/docs/specs/otel/metrics/

This will allow existing codecarbon users to view codecarbon metrics alongside their regular observability tools such as Jaeger, Honeycomb etc. (thanks to the OpenTelemetry standard). This allows per-trace carbon tracking with additional context in addition to trend analysis.

Proposed Implementation

The proposed implementation is to follow a similar pattern to the Prometheus feature:

• Add save_metrics_to_otel and save_traces_to_otel flags to the track_emissions decorator. These flags will govern if full traces are collected along with metrics and persisted in the OpenTelemetry collector.
• Allow configuration of OTel Collector

I will add a more detailed technical proposal and MR if you agree this is a feature worth implementing. I'm very open to discussion and ideas, and look forward to contributing in this space.

Start by reviewing the existing Prometheus feature and the track_emissions decorator, which the issue identifies as the implementation pattern. Define the OpenTelemetry collector configuration and the required metrics and trace behavior; done means the proposed flags support collection and persistence with trace correlation.