feat(bindings/python): support pickle [de]serialization for Operator #2048

Job	Run time
build_all_features	4m 50s
build_all_platforms (ubuntu-latest)	2m 38s
build_default_features (ubuntu-latest)	40s
build_all_platforms (macos-latest)	2m 20s
build_under_wasm	50s
build_default_features (macos-latest)	34s
check_clippy	3m 52s
build_all_platforms (windows-latest)	5m 37s
build_default_features (windows-latest)	2m 45s
check_docs	3m 50s
check_msrv	32s
unit	6m 41s
	35m 9s

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