Default exporter that supports OTLP/HTTP via HTTP/2

[I576510]

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Is your feature request related to a problem? Please describe.

There's currently no exporter that supports OTLP/HTTP via HTTP/2

Describe the solution you'd like

As discussed earlier in, https://github.com/open-telemetry/opentelemetry-js/issues/5615

Describe alternatives you've considered

JavaScript (Node.js) doesn’t auto-switch protocols at runtime — you explicitly choose the protocol via the exporter you use (http or grpc).

If you use @opentelemetry/exporter-trace-otlp-http → you're using HTTP/1.1 by default.

If you use @opentelemetry/exporter-trace-otlp-grpc → you're using HTTP/2 (because gRPC requires HTTP/2).

Additional context

Add any other context or screenshots about the feature request here.