feat: add support for parameters in gemini models

[KaustubhKumar05]

• [x] use startChat conditionally since it is not supported by gemini-1.5-pro

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🦋 Changeset detected

Latest commit: b858f80ad44f32b1a868f313ad9f52703324a43b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | -------------------- | ----- | | @empiricalrun/ai | Minor | | @empiricalrun/core | Patch | | @empiricalrun/scorer | Patch | | @empiricalrun/cli | Patch |

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Empirical Run Summary

Stats	Run #0d56: gpt-3.5-turbo	Run #713d: gpt-4-turbo-preview
outputs	100%	100%
is-json	100%	100%

Total dataset samples: 2