Revert "const-oid: add `ObjectIdentifierRef`; use for `db` (#1212)" (… #824

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 45s
test (1.65.0)	1m 53s
build (1.65.0, wasm32-unknown-unknown)	1m 43s
test (stable)	32s
build (stable, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	28s
minimal-versions / minimal-versions	40s
	7m 26s

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