fix: add json serialization support for neo4j sdk types #453

Job	Run time
search	5s
test (lib/metadata)	14s
test (lib/wasmextractor)	13s
test (lib/manifest)	8s
test (sdk/go)	11s
test (sdk/go/examples/graphql)	21s
test (sdk/go/examples/time)	18s
test (sdk/go/examples/simple)	18s
test (sdk/go/examples/auth)	12s
test (sdk/go/examples/anthropic-functions)	12s
test (sdk/go/examples/postgresql)	21s
test (sdk/go/examples/dgraph)	14s
test (sdk/go/examples/embedding)	14s
test (sdk/go/examples/vectors)	18s
test (sdk/go/examples/collections)	18s
test (sdk/go/examples/classification)	11s
test (sdk/go/examples/neo4j)	12s
test (sdk/go/examples/textgeneration)	18s
test (sdk/go/examples/http)	12s
test (sdk/go/templates/default)	10s
test (runtime)	1m 4s
test (runtime/languages/golang/testdata)	10s
	5m 54s

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