Add new `GetLedgerConfig` query #5258

Job	Run time
Build and test (8.10.7, default, all)	58s
Build and test (9.6.6, default, all)	1m 5s
Build and test (9.10.1, default, all)	52s
Run benchmarks	1s
Deploy documentation to GitHub Pages	1s
	2m 57s

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