const-oid: migrate database to `ObjectIdentifierRef` #745

Job	Run time
build (1.75.0, thumbv7em-none-eabi)	32s
minimal-versions	0s
build (1.75.0, wasm32-unknown-unknown)	32s
test (1.75.0)	27s
build (stable, thumbv7em-none-eabi)	38s
test (stable)	25s
build (stable, wasm32-unknown-unknown)	19s
	2m 53s

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