[WIP] Add an option to stop geth once in sync

[glaksmono]

The addition of a new flag that would stop and exit when the chain has been caught up.

Reference Issue: #16400

Discussion

1. I'm figuring out which part of the code that identifies the chain has been synced here

Correct me if I'm wrong, but I think the Completed State should be at the api.go?

I needed to breakdown DoneEvent vs. FailedEvent in the func (api *PublicDownloaderAPI) eventLoop() to be like the following:

			case DoneEvent:
                                 // Is this the Done state?
				notification = false
			case FailedEvent:
				notification = false

If so, I'd apply the fix and re-create the PR

2. I've been trying to test and find the completed state for geth to exit, but then I read this: Block number is always zero with fast syncmode #16411 (comment) - Thoughts about it?

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