feat(bindings/python): support pickle [de]serialization for Operator #2050

Job	Run time
build_all_features	3m 47s
build_all_platforms (ubuntu-latest)	2m 33s
build_all_platforms (macos-latest)	2m 14s
build_default_features (ubuntu-latest)	34s
build_all_platforms (windows-latest)	3m 40s
build_default_features (macos-latest)	40s
build_default_features (windows-latest)	2m 21s
build_under_wasm	49s
check_clippy	3m 45s
check_docs	3m 44s
check_msrv	32s
unit	3m 47s
	28m 26s

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