support gatewayApi HTTPRoute creation by v1beta1 for otel CR

[Horiodino]

Description

Adds support for generating Gateway API HTTPRoute resources from the OpenTelemetryCollector v1beta1 spec. Includes the new httpRoute configuration.

Link to tracking Issue(s)

• Resolves: Support HTTPRoute creation by v1beta1 otel CR #4361

Testing

• added unit tests for httpRoute
• ran controller locally with httpRoute enabled

Documentation

• added API docs and changelog.

  apiVersion: opentelemetry.io/v1beta1
  kind: OpenTelemetryCollector
  spec:
    mode: deployment
    httpRoute:
      enabled: true
      gateway: my-gateway        # required
      gatewayNamespace: default   (defaults to collector namespace)
      hostName: "otel.example.com" 

  When enabled, the operator automatically generates an HTTPRoute per HTTP port exposed by the collector’s configuration.

[Horiodino]

cc @frzifus