Provides the Lagom dev mode service locator.
It can be used both by Lagom services, and also by non Lagom services, such as pure Play applications, in order to
use the Lagom dev mode service locator. When used with non Lagom applications, serviceInfo will need to manually
be implemented to return the service name.
It expects the service locator URL to be provided using the lagom.service-locator.url property, which by default
will be automatically provided to the service by Lagom's dev mode build plugins.
If being used in a Lagom service, this will be implemented by
com.lightbend.lagom.scaladsl.server.LagomServerComponents, however if it's being
used by a Play application, this will need to be provided manually.