feat: improve OpenAI model APIs and examples to better support audio, images, and tool calling #469

Job	Run time
search	3s
lint (runtime/languages/golang/testdata)	5s
lint (runtime)	1m 4s
lint (sdk/go/examples/time)	5s
lint (sdk/go/examples/auth)	21s
lint (sdk/go/examples/http)	8s
lint (sdk/go/examples/textgeneration)	6s
lint (sdk/go/examples/anthropic-functions)	7s
lint (sdk/go/examples/neo4j)	7s
lint (sdk/go/examples/vectors)	6s
lint (sdk/go/examples/simple)	8s
lint (sdk/go/examples/classification)	9s
lint (sdk/go/examples/dgraph)	6s
lint (sdk/go/examples/collections)	6s
lint (sdk/go/examples/embedding)	6s
lint (sdk/go/examples/postgresql)	7s
lint (sdk/go/examples/graphql)	6s
lint (sdk/go)	11s
lint (sdk/go/templates/default)	7s
lint (lib/wasmextractor)	7s
lint (lib/metadata)	7s
lint (lib/manifest)	7s
	3m 39s

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