Add Google Gemini vision provider implementation

package-lock.json

@@ -8,6 +8,7 @@
             "name": "video-audio-description-generator",
             "version": "1.0.0",
             "dependencies": {
+                "@google/generative-ai": "^0.24.0",
                 "axios": "^1.6.2",
                 "dotenv": "^16.3.1",
                 "fluent-ffmpeg": "^2.1.2",
@@ -18,6 +19,14 @@
                 "node": ">=14.0.0"
             }
         },
+        "node_modules/@google/generative-ai": {
+            "version": "0.24.0",
+            "resolved": "https://registry.npmjs.org/@google/generative-ai/-/generative-ai-0.24.0.tgz",
+            "integrity": "sha512-fnEITCGEB7NdX0BhoYZ/cq/7WPZ1QS5IzJJfC3Tg/OwkvBetMiVJciyaan297OvE4B9Jg1xvo0zIazX/9sGu1Q==",
+            "engines": {
+                "node": ">=18.0.0"
+            }
+        },
         "node_modules/@types/node": {
             "version": "18.19.79",
             "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.79.tgz",