fix: add json serialization support for neo4j sdk types #454

Job	Run time
search	9s
lint (lib/metadata)	6s
lint (lib/wasmextractor)	7s
lint (lib/manifest)	11s
lint (sdk/go)	18s
lint (sdk/go/examples/graphql)	6s
lint (sdk/go/examples/time)	7s
lint (sdk/go/examples/simple)	11s
lint (sdk/go/examples/auth)	9s
lint (sdk/go/examples/anthropic-functions)	6s
lint (sdk/go/examples/postgresql)	12s
lint (sdk/go/examples/dgraph)	8s
lint (sdk/go/examples/embedding)	8s
lint (sdk/go/examples/vectors)	8s
lint (sdk/go/examples/collections)	10s
lint (sdk/go/examples/classification)	7s
lint (sdk/go/examples/neo4j)	7s
lint (sdk/go/examples/textgeneration)	5s
lint (sdk/go/examples/http)	12s
lint (sdk/go/templates/default)	6s
lint (runtime)	17s
lint (runtime/languages/golang/testdata)	12s
	3m 22s

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