Gemini BYOK provider using native Gemini API (#1310)

* gemini native BYOK provider

* Handle abort ,  add tests and few cleanup

* handle images

* Cleanup

* Few minor updates

* fix formatting

* add image 'data'

* Move autoflush on tool part to linkifier

* merge main

* Enable only known models

* merge main

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Co-authored-by: vijay upadya <vj@example.com>
Co-authored-by: Logan Ramos <loganramos@microsoft.com>

Author: 3 people

package-lock.json

@@ -4308,6 +4308,7 @@
 		"@anthropic-ai/claude-code": "^1.0.120",
 		"@anthropic-ai/sdk": "^0.63.0",
 		"@github/copilot": "^0.0.338",
+		"@google/genai": "^1.22.0",
 		"@humanwhocodes/gitignore-to-minimatch": "1.0.2",
 		"@microsoft/tiktokenizer": "^1.0.10",
 		"@vscode/copilot-api": "^0.1.10",