Revert "const-oid: add `ObjectIdentifierRef`; use for `db` (#1212)" (… #868

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 46s
build (1.65.0, wasm32-unknown-unknown)	1m 44s
test (1.65.0)	1m 53s
build (stable, thumbv7em-none-eabi)	26s
test (stable)	33s
build (stable, wasm32-unknown-unknown)	23s
minimal-versions / minimal-versions	33s
	7m 18s

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