Support for tracing using OpenTelemetry

[sjberman]

As a user of NGF
I want NGF to have the ability to generate and send traces
So that I can easily get tracing for all of my traffic to help debug my environment.

The CRD defined in #929 should be used as the configuration entrypoint for a user.

Question
Should the CRD be attached to the GatewayClass or the Gateway?: Answer: GatewayClass

Reference
Otel POC: https://github.com/ciarams87/nginx-gateway-fabric/tree/spike/try-otel

Acceptance Criteria

- Data plane CRD is initialized when NGF is installed
- CRD is watched for and handled if attached to our Gateway

• When enabled, the NGINX otel module is utilized to generate traces.
• Generated traces can be exported to a configurable endpoint.
• All fields from otel_exporter directive are configurable by the user.
• Documentation is created to explain this feature.
  - Enhancement proposal is updated to "Completed"

To be merged into the feat/data-plane-crd feature branch.

[mpstefan]

Blocked by #929

[ciarams87]

Blocked by #1261

[sjberman]

Closing in favor of new stories in the epic.