PR feedback: Add a runtime switch for the aggressive SCC merging

PR feedback: Add a runtime switch for the aggressive SCC merging

Previously every time we add a new runtime setting for the bridge
processor we have added a new callback for it. Because this is getting
unweildy, and also because some of these settings might have been
broken by recent init order changes, I created a new set_config
callback and merged the existing set_dump_prefix and enable_processing
with it.