dev: Add afterRegisterGraph hook replacing afterCreateSignal

[thetarnav]

A afterRegisterGraph hook allows for both signals, stores and any other custom value registered with DEV.registerGraph to be captured by the devtools when they are created, and even if created outside of a reactive graph - unowned.
This also makes the afterCreateSignal hook, that I added before, pointless so I deprecated it. My bad for not thinking about this before.

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Latest commit: c9947e3

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[coveralls]

Pull Request Test Coverage Report for Build 12603755610

Details

• 8 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 85.756%

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Files with Coverage Reduction	New Missed Lines	%
packages/solid/src/reactive/scheduler.ts	1	80.95%

Totals
Change from base Build 11846786421:	0.1%
Covered Lines:	2298
Relevant Lines:	2615

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💛 - Coveralls