[vcpkg] Create a feature for OTel ABI 2.0 in vcpkg

We build OTel in our CI and want to add a build with cmake and otel abi 2.0. We use vcpkg as a package manager.

My ideal vcpkg.json would look like

    {
      "name": "opentelemetry-cpp",
      "features": [
        "abi-2"
      ]
    }

Is your feature request related to a problem?
No

Describe the solution you'd like
The current vcpkg does not have an otel abi feature (https://github.com/microsoft/vcpkg/blob/42301df395852935d105799de93abf5481f34f1a/ports/opentelemetry-cpp/vcpkg.json)

Describe alternatives you've considered
Building from source.

Additional context
N/A