added `key_permissions` method to package LogState #609

Job	Run time
Install warg CLI	5m 49s
Format source code	8s
Run PostgreSQL tests (ubuntu-latest)	6m 23s
Run tests (ubuntu-latest)	4m 1s
Run tests (macos-latest)	6m 28s
Run tests (windows-latest)	8m 48s
	31m 37s

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