feat: Added code for qna_using_query_routing using Gemini

[CharulataShelar]

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curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/main/apply.pl' |
perl - 'https://github.com/GoogleCloudPlatform/generative-ai/actions/runs/9097640322/attempts/1'

Available 📚 dictionaries could cover words not in the 📘 dictionary

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cspell:java/src/java.txt	2464	13	6

Consider adding them (in .github/workflows/spelling.yaml) for uses: check-spelling/check-spelling@main in its with:

      with:
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Errors (4)

See the 📂 files view, the 📜action log, or 📝 job summary for details.

❌ Errors	Count
ℹ️ binary-file	2
ℹ️ candidate-pattern	87
❌ check-file-path	440
❌ forbidden-pattern	28

See ❌ Event descriptions for more information.

[holtskinner]

Quite a few of the comments have been sitting in this PR for a while, without any action. Feel free to re-open this PR when ready.