feat(bindings/python): support pickle [de]serialization for Operator … #2054

Job	Run time
build_all_platforms (ubuntu-latest)	3m 1s
build_all_features	4m 51s
build_all_platforms (macos-latest)	2m 28s
build_default_features (ubuntu-latest)	40s
build_all_platforms (windows-latest)	6m 36s
build_default_features (macos-latest)	36s
check_docs	3m 50s
build_default_features (windows-latest)	1m 45s
check_clippy	5m 11s
check_msrv	31s
unit	7m 26s
build_under_wasm	1m 48s
	38m 43s

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