Add RBS for google-cloud-ai_platform-v1 1.15

[RYOTA-KOBA]

Overview

Add RBS type definitions for google-cloud-ai_platform-v1 version 1.15.

Defined classes / modules

• Google::Cloud::AIPlatform::V1::Part
• Google::Cloud::AIPlatform::V1::Content
• Google::Cloud::AIPlatform::V1::Candidate
• Google::Cloud::AIPlatform::V1::GenerateContentResponse
• Google::Cloud::AIPlatform::V1::GenerateContentRequest
• Google::Cloud::AIPlatform::V1::PredictionService::Client
• Google::Cloud::AIPlatform::V1::PredictionService::Client::Configuration

Notes

• Focused on the generate_content API as the primary use case for Gemini model inference.
• attr_accessor is used for read-write protobuf fields ([rw]), and def for read-only fields ([r]).
• Configuration#timeout is typed as ::Numeric? to match config_attr :timeout, nil, ::Numeric, nil in the source.
• The test covers both overloads of generate_content (Hash and GenerateContentRequest), as well as Configuration setters via block initialization.

[github-actions]

@RYOTA-KOBA Thanks for your contribution!

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See also: https://github.com/ruby/gem_rbs_collection/blob/main/docs/CONTRIBUTING.md

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• /merge: Merge this PR if CI passes

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google-cloud-ai_platform-v1

This RBS files are newly added.

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[RYOTA-KOBA]

/merge