Namespace for pipeline options #19331
Description
Pipeline options have a name and group. But currently they are identified by name only. This allows for collision if groups used the same name. There should be a way to fully qualify an option, for example with a group prefix. This requires changes to both the SDK clients (command line parsing etc.) and runners (shared code for all Java runners).
Imported from Jira BEAM-6531. Original Jira may contain additional context.
Reported by: thw.