Guice EDSL for ServiceGraphBuilder

[keeferrourke]

Follow-up for #984. This PR introduces a small EDSL to specify Service dependencies and enhancements.

This provides a ServiceModule which can be installed to other modules, providing an easy way to build Service dependency graphs with Guice.

The new provider method provideServiceGraphBuilder creates a builder for the graph. It is intended to supercede the provideServiceManager method (see note) as we migrate from CoordinatedService to CoordinatedService2.

Next steps will be to deprecate CoordinatedService and DependentService, then migrate modules to specify their graphs using the EDSL, like in the simple example below:

class ExampleModule : KAbstractModule() {
  override configure() {
    // Creates Service graph where ExampleService depends on Provider, and start-up order is:
    // Provider -> ExampleService -> Enhancer; and shut-down order is:
    // Enhancer -> ExampleService -> Provider.
    // Enhancer and Provider services may be installed in this module, or in another module by
    // install(service<X>()).
    install(ServiceModule<ExampleService>()
      .enhancedBy<Enhancer>()
      .dependsOn<Provider>()
    )
  }
}

[swankjesse]

#324