Add new `GetLedgerConfig` query #5244

Job	Run time
Build and test (8.10.7, default, all)	4m 21s
Build and test (9.6.6, default, all)	5m 32s
Build and test (9.10.1, default, all)	4m 35s
Deploy documentation to GitHub Pages	0s
Run benchmarks	0s
	14m 28s

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