feat(genai): Add Count Tokens Samples

[holtskinner]

Description

googlegenaisdk_count_tokens_with_txt
googlegenaisdk_count_tokens_with_txt_img_vid
googlegenaisdk_count_tokens_resp_with_txt
googlegenaisdk_count_tokens_compute_with_txt

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• genai/count_tokens/count_tokens_compute_with_txt.py:17, tag googlegenaisdk_count_tokens_compute_with_txt
• genai/count_tokens/count_tokens_resp_with_txt.py:17, tag googlegenaisdk_count_tokens_resp_with_txt
• genai/count_tokens/count_tokens_with_txt.py:17, tag googlegenaisdk_count_tokens_with_txt
• genai/count_tokens/count_tokens_with_txt_img_vid.py:17, tag googlegenaisdk_count_tokens_with_txt_img_vid

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[msampathkumar]

Approved with minor nits