Deprecate GRPC global pin in favor of configuration API#702
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GRPC uses
Datadog::Pinto drive configuration, for global settings and individual interceptors.This pull requests changes the integration to use the configuration API instead of the global pin, and deprecates the use of
GRPC.datadog_pinas a means to drive configuration, and now raises warnings when it is accessed this way. Instead, when the pin is accessed and configured, it will apply the appropriate configuration via the configuration API.It will still continue to use
Datadog::Pinobjects when trace settings are configured for an individual interceptor, so this part of the API will remain the same.Changes here should be backwards compatible; any users using the global pin directly should receive a warning to upgrade while still preserving existing functionality. Users who use the pin attached to interceptors should not see a change in behavior there.