exp/services/ledgerexporter: Add metadata to exported files #3747

Job	Run time
Test (and push) verify-range image	2m 40s
Integration tests (ubuntu-20.04, 1.21, 12, 20)	2m 6s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	2m 8s
Integration tests (ubuntu-20.04, 1.21, 16, 20)	2m 20s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	2m 27s
Test and push the Ledger Exporter images	1m 27s
Integration tests (ubuntu-20.04, 1.22, 12, 20)	2m 1s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	1m 55s
Integration tests (ubuntu-20.04, 1.22, 16, 20)	2m 14s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	1m 50s
Integration tests (ubuntu-22.04, 1.21, 12, 20)	2m 35s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	2m 21s
Integration tests (ubuntu-22.04, 1.21, 16, 20)	2m 20s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	2m 22s
Integration tests (ubuntu-22.04, 1.22, 12, 20)	2m 12s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	1m 59s
Integration tests (ubuntu-22.04, 1.22, 16, 20)	1m 53s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	3m 11s
	40m 1s

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