Use new resource.New() primitive

[jmacd]

Is your feature request related to a problem? Please describe.
The 0.14 release will include open-telemetry/opentelemetry-go#1235, which adds a new resource.New() primitive. The primitive will take over some of the resource support in this repository, including the host.name, telemetry.sdk.*, and environment variable builtins.

Describe the solution you'd like
When updating to 0.14, remove the corresponding code and call resource.New().