fix google model name and add gemini 1.5 flash

[meetpateltech]

This PR includes the following changes:

1. Rename "Gemini Flash" to "Gemini 1.5 Pro" because the model name used is "Gemini 1.5 Pro," but it is currently named "Gemini Flash."
2. I made the 'imageInput' property true, as 'Gemini 1.5 Pro' supports image input.
3. Add "Gemini 1.5 Flash" with the correct model ID and name. It is similar to "Gemini 1.5 Pro" but faster in comparison.

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🚀	This description was created by Ellipsis for commit 04c42ba

Summary:

This PR renames 'Gemini Flash' to 'Gemini 1.5 Pro', updates its image input capability, and adds a new model 'Gemini 1.5 Flash' with appropriate settings and type definitions.

Key points:

• Rename Gemini Flash to Gemini 1.5 Pro in lib/models/llm/google-llm-list.ts.
• Update imageInput to true for Gemini 1.5 Pro.
• Add Gemini 1.5 Flash with settings in lib/chat-setting-limits.ts and lib/models/llm/google-llm-list.ts.
• Update types/llms.ts to include gemini-1.5-flash.

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Generated with ❤️ by ellipsis.dev

[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to 04c42ba in 56 seconds

More details

• Looked at 74 lines of code in 3 files
• Skipped 0 files when reviewing.
• Skipped posting 1 drafted comments based on config settings.

1. lib/chat-setting-limits.ts:49

• Draft comment:
  The settings for "Gemini 1.5 Flash" are identical to "Gemini 1.5 Pro". If "Gemini 1.5 Flash" is intended to be faster, consider adjusting its settings (e.g., MAX_TOKEN_OUTPUT_LENGTH or MAX_CONTEXT_LENGTH) to reflect its enhanced capabilities.
• Reason this comment was not posted:
  Confidence of 0% on close inspection, compared to threshold of 50%.

Workflow ID: wflow_yvZeUqoVb7ZTWBgZ

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[faraday]

Tested this locally, working fine.