feat(genai): add text generation samples - part 3

[jdomingr]

Description

Add new text generation samples (3):

• Text generation with a new chat session
• Text generation with a new chat stream session
• Text generation transcript with audio input

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Format Guide
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• genai/snippets/src/main/java/genai/textgeneration/TextGenerationChatStreamWithText.java:19, tag googlegenaisdk_textgen_chat_stream_with_txt
• genai/snippets/src/main/java/genai/textgeneration/TextGenerationChatWithText.java:19, tag googlegenaisdk_textgen_chat_with_txt
• genai/snippets/src/main/java/genai/textgeneration/TextGenerationTranscriptWithGcsAudio.java:19, tag googlegenaisdk_textgen_transcript_with_gcs_audio

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[gemini-code-assist]

Summary of Changes

Hello @jdomingr, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request expands the GenAI Java samples by adding three new examples. These samples demonstrate various text generation capabilities, including standard and streaming chat interactions, and the ability to transcribe audio from Google Cloud Storage into text. The goal is to provide developers with clear, runnable code to integrate these features into their applications.

Highlights

• New Chat Session Sample: Introduces TextGenerationChatWithText.java to demonstrate creating and interacting with a new chat session for text generation.
• New Chat Stream Session Sample: Introduces TextGenerationChatStreamWithText.java to showcase streaming responses from a chat session.
• New Audio Transcript Sample: Introduces TextGenerationTranscriptWithGcsAudio.java to illustrate generating text transcripts from audio input stored in Google Cloud Storage.

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[gemini-code-assist]

Code Review

This pull request introduces three new text generation samples for the GenAI SDK, demonstrating chat streams, chat sessions with system instructions, and audio transcription from GCS. The additions are accompanied by corresponding integration tests. The new samples are clear and useful. However, I've identified a potential issue in the TextGenerationChatWithText sample where chained calls to systemInstruction would lead to the first instruction being overwritten. I've provided a suggestion to correct this by using the list-based overload of the method.

[msampathkumar]

LGTM. Need to fix the branch file conflicts.