feat(genai sdk): code samples

[Valeriy-Burlaka]

Description

Samples for text generation, content caching, count tokens, and tools.

Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 29 region tags.

• genai/content_cache/contentcache_create_with_txt_gcs_pdf.go:18, tag googlegenaisdk_contentcache_create_with_txt_gcs_pdf
• genai/content_cache/contentcache_delete.go:18, tag googlegenaisdk_contentcache_update
• genai/content_cache/contentcache_update.go:18, tag googlegenaisdk_contentcache_update
• genai/content_cache/contentcache_use_with_txt.go:18, tag googlegenaisdk_contentcache_use_with_txt
• genai/controlled_generation/ctrlgen_with_enum_schema.go:18, tag googlegenaisdk_ctrlgen_with_enum_schema
• genai/controlled_generation/ctrlgen_with_nullable_schema.go:18, tag googlegenaisdk_ctrlgen_with_nullable_schema
• genai/controlled_generation/ctrlgen_with_resp_schema.go:18, tag googlegenaisdk_ctrlgen_with_resp_schema
• genai/count_tokens/counttoken_compute_with_txt.go:18, tag googlegenaisdk_counttoken_compute_with_txt
• genai/count_tokens/counttoken_resp_with_txt.go:18, tag googlegenaisdk_counttoken_resp_with_txt
• genai/count_tokens/counttoken_with_txt.go:18, tag googlegenaisdk_counttoken_with_txt
• genai/count_tokens/counttoken_with_txt_vid.go:18, tag googlegenaisdk_counttoken_with_txt_vid
• genai/text_generation/textgen_code_with_local_video.go:18, tag googlegenaisdk_textgen_code_with_local_video
• genai/text_generation/textgen_code_with_pdf.go:18, tag googlegenaisdk_textgen_code_with_pdf
• genai/text_generation/textgen_config_with_txt.go:18, tag googlegenaisdk_textgen_config_with_txt
• genai/text_generation/textgen_sys_instr_with_txt.go:18, tag googlegenaisdk_textgen_sys_instr_with_txt
• genai/text_generation/textgen_transcript_with_gcs_audio.go:18, tag googlegenaisdk_textgen_transcript_with_gcs_audio
• genai/text_generation/textgen_with_gcs_audio.go:18, tag googlegenaisdk_textgen_with_gcs_audio
• genai/text_generation/textgen_with_multi_img.go:18, tag googlegenaisdk_textgen_with_multi_img
• genai/text_generation/textgen_with_multi_local_img.go:18, tag googlegenaisdk_textgen_with_multi_local_img
• genai/text_generation/textgen_with_mute_video.go:18, tag googlegenaisdk_textgen_with_mute_video
• genai/text_generation/textgen_with_txt.go:18, tag googlegenaisdk_textgen_with_txt
• genai/text_generation/textgen_with_txt_img.go:18, tag googlegenaisdk_textgen_with_txt_img
• genai/text_generation/textgen_with_txt_stream.go:18, tag googlegenaisdk_textgen_with_txt_stream
• genai/text_generation/textgen_with_video.go:18, tag googlegenaisdk_textgen_with_video
• genai/text_generation/textgen_with_youtube_video.go:18, tag googlegenaisdk_textgen_with_youtube_video
• genai/tools/tools_code_exec_with_txt.go:18, tag googlegenaisdk_tools_code_exec_with_txt
• genai/tools/tools_code_exec_with_txt_local_img.go:18, tag googlegenaisdk_tools_code_exec_with_txt_local_img
• genai/tools/tools_func_desc_with_txt.go:18, tag googlegenaisdk_tools_func_desc_with_txt
• genai/tools/tools_google_search_with_txt.go:18, tag googlegenaisdk_tools_google_search_with_txt

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