fix(gemini): use function role for message contains tool-result

[thucpn]

Error: Content with role 'user' can't contain 'functionResponse' part

Chat History when debugging:

const chatHistory = [
	{ role: "user", parts: [{ text: "How much is 5 + 5? then divide by 2" }] },
	{ role: "model", parts: [{ functionCall: { name: "sumNumbers", args: { a: 5, b: 5 } } }] },
	{ role: "user", parts: [{ functionResponse: { name: "sumNumbers", response: { result: "10" } } }] },
	{ role: "model", parts: [{ functionCall: { name: "divideNumbers", args: { a: 10, b: 2 } } }] }
];

VALID_PARTS_PER_ROLE from @google/generative-ai package
https://github.com/google-gemini/generative-ai-js/blob/2df2af03bb07dcda23b07af1a7135a8b461ae64e/src/methods/chat-session-helpers.ts#L34

const VALID_PARTS_PER_ROLE = {
	user: ["text", "inlineData"],
	function: ["functionResponse"],
	model: ["text", "functionCall", "executableCode", "codeExecutionResult"],
	system: ["text"],
};

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🦋 Changeset detected

Latest commit: 65a0bcf

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

This PR includes changesets to release 13 packages

Name	Type
@llamaindex/google	Patch
llamaindex	Patch
@llamaindex/unit-test	Patch
@llamaindex/doc	Patch
@llamaindex/cloudflare-worker-agent-test	Patch
@llamaindex/next-agent-test	Patch
@llamaindex/nextjs-edge-runtime-test	Patch
@llamaindex/next-node-runtime-test	Patch
@llamaindex/waku-query-engine-test	Patch
@llamaindex/autotool	Patch
@llamaindex/experimental	Patch
@llamaindex/autotool-01-node-example	Patch
@llamaindex/autotool-02-next-example	Patch

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