feat: add SSE streaming, thinking models, and modernized Part struct

examples/generate_image.rs

@@ -1,9 +1,8 @@
 use std::{error::Error, io::Cursor};
 
 use gemini_rs::prelude::{
-    GeminiClient, PersonGeneration, PredictImageRequest, PredictImageRequestParameters,
+    GeminiClient, PredictImageRequest, PredictImageRequestParameters,
     PredictImageRequestParametersOutputOptions, PredictImageRequestPrompt,
-    PredictImageSafetySetting,
 };
 use image::{ImageFormat, ImageReader};
 
@@ -35,8 +34,8 @@ pub async fn main() -> Result<(), Box<dyn Error>> {
                 mime_type: Some("image/jpeg".to_string()),
                 compression_quality: Some(75),
             }),
-            person_generation: Some(PersonGeneration::AllowAll),
-            safety_setting: Some(PredictImageSafetySetting::BlockOnlyHigh),
+            person_generation: Some("allow_all".to_string()),
+            safety_setting: Some("block_only_high".to_string()),
             ..Default::default()
         },
     };