feat: Complete implementation of reference counted objects #41

Job	Run time
build_docs	37s
with_features (ubuntu, 1.77, serde)	53s
no_features (ubuntu, 1.77)	53s
with_features (ubuntu, stable, serde)	29s
no_features (ubuntu, stable)	46s
with_features (ubuntu, beta, serde)	55s
no_features (ubuntu, beta)	52s
with_features (ubuntu, nightly, serde)	1m 7s
no_features (ubuntu, nightly)	45s
with_features (macos, 1.77, serde)	47s
with_features (macos, stable, serde)	17s
no_features (macos, 1.77)	59s
with_features (macos, beta, serde)	25s
no_features (macos, stable)	38s
with_features (macos, nightly, serde)	11s
no_features (macos, beta)	46s
with_features (windows, 1.77, serde)	1m 0s
no_features (macos, nightly)	55s
with_features (windows, stable, serde)	58s
no_features (windows, 1.77)	1m 33s
with_features (windows, beta, serde)	1m 0s
no_features (windows, stable)	3m 0s
no_features (windows, beta)	1m 42s
no_features (windows, nightly)	1m 32s
	23m 0s

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