Add `TriblerDatabaseMigrationChain` #2373

Job	Run time
gatekeeper	3s
env	2s
changes	3s
windows	0s
mac	0s
ubuntu	0s
documentation	0s
scripttest / run	1m 9s
guitest_nix	0s
pytest	0s
guitest / run (windows-latest)	2m 41s
coverage / generate and upload	5m 55s
	9m 53s

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