fix: add json serialization support for neo4j sdk types #341

Job	Run time
search	3s
build (sdk/go/tools/modus-go-build)	9s
build (sdk/go/examples/graphql)	44s
build (sdk/go/examples/time)	32s
build (sdk/go/examples/simple)	32s
build (sdk/go/examples/auth)	37s
build (sdk/go/examples/anthropic-functions)	41s
build (sdk/go/examples/postgresql)	33s
build (sdk/go/examples/dgraph)	38s
build (sdk/go/examples/embedding)	36s
build (sdk/go/examples/vectors)	28s
build (sdk/go/examples/collections)	39s
build (sdk/go/examples/classification)	35s
build (sdk/go/examples/neo4j)	34s
build (sdk/go/examples/textgeneration)	41s
build (sdk/go/examples/http)	41s
	8m 43s

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