vertexai: seed missing in GenerationConfig

[erikdubbelboer]

According to these documentations ([1], [2]) seed is supported by the API, I guess the generated code just needs to be updated to support this.

Missing here:

google-cloud-go/vertexai/genai/aiplatformpb_veneer.gen.go

Lines 646 to 680 in d448fbb

	// GenerationConfig is generation config.
	type GenerationConfig struct {
	// Optional. Controls the randomness of predictions.
	Temperature *float32
	// Optional. If specified, nucleus sampling will be used.
	TopP *float32
	// Optional. If specified, top-k sampling will be used.
	TopK *int32
	// Optional. Number of candidates to generate.
	CandidateCount *int32
	// Optional. The maximum number of output tokens to generate per message.
	MaxOutputTokens *int32
	// Optional. Stop sequences.
	StopSequences []string
	// Optional. Positive penalties.
	PresencePenalty *float32
	// Optional. Frequency penalties.
	FrequencyPenalty *float32
	// Optional. Output response mimetype of the generated candidate text.
	// Supported mimetype:
	// - `text/plain`: (default) Text output.
	// - `application/json`: JSON response in the candidates.
	// The model needs to be prompted to output the appropriate response type,
	// otherwise the behavior is undefined.
	// This is a preview feature.
	ResponseMIMEType string
	// Optional. The `Schema` object allows the definition of input and output
	// data types. These types can be objects, but also primitives and arrays.
	// Represents a select subset of an [OpenAPI 3.0 schema
	// object](https://spec.openapis.org/oas/v3.0.3#schema).
	// If set, a compatible response_mime_type must also be set.
	// Compatible mimetypes:
	// `application/json`: Schema for JSON response.
	ResponseSchema *Schema
	}

1: https://cloud.google.com/vertex-ai/docs/reference/rest/v1/GenerationConfig
2: https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/inference#request

[codyoss]

cc @jba @eliben

[eliben]

cc @happy-qiao