.Net: Python: New Feature: Add `thinking_level` to Gemini connector

[markmcd]

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name: Add thinking_level to Gemini Python connector
about: Allow users to specify thinking levels

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Gemini 3+ models support specifying thinking_level, which gives users control over their token and latency budgets.

Older models support a thinking_budget instead, but for simplicity I am proposing only support for the latest feature.

The .NET library seems to support this already:

semantic-kernel/dotnet/src/Connectors/Connectors.Google/GeminiThinkingConfig.cs

Lines 30 to 32 in 2a719ca

	[JsonPropertyName("thinking_level")]
	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
	public string? ThinkingLevel { get; set; }