[Enhancement] Added text_to_speech, text_to_image, image_edit example tasks (#128)

Added text_to_speech, text_to_image, image_edit example tasks

Author: psriramsnc

tasks/examples/image_edit/data/car_photo.png

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+data_config:
+  source:
+    type: "disk"
+    file_path: "tasks/examples/image_edit/multi_image_edits.json"
+    file_format: "json"
+
+graph_config:
+  nodes:
+    edit_image:
+      node_type: llm
+      output_keys: edited_image
+      prompt:
+        - user:
+            - type: image_url
+              image_url: "{images}"
+            - type: text
+              text: "{edit_instruction}"
+      model:
+        name: gemini_2_5_pro
+        output_type: image
+        parameters:
+          quality: medium
+
+  edges:
+    - from: START
+      to: edit_image
+    - from: edit_image
+      to: END
+
+output_config:
+  output_map:
+    id:
+      from: id
+    title:
+      from: title
+    original_image:
+      from: source_image
+    edit_instruction:
+      from: edit_instruction
+    edited_image:
+      from: edited_image

tasks/examples/image_edit/data/landscape.png

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+[
+  {
+    "edit_instruction": "Remove the red chair from the room",
+    "id": "edit_001",
+    "source_image": "tasks/examples/image_edit/data/room_photo.png",
+    "title": "Remove Background Object"
+  },
+  {
+    "edit_instruction": "Change the car color from blue to red",
+    "id": "edit_002",
+    "source_image": "tasks/examples/image_edit/data/car_photo.png",
+    "title": "Change Color"
+  },
+  {
+    "edit_instruction": "Add a rainbow in the sky",
+    "id": "edit_003",
+    "source_image": "tasks/examples/image_edit/data/landscape.png",
+    "title": "Add Element"
+  },
+  {
+    "edit_instruction": "Make the background blurry and add bokeh effect",
+    "id": "edit_004",
+    "source_image": "tasks/examples/image_edit/data/portrait.png",
+    "title": "Style Transfer"
+  }
+]

tasks/examples/image_edit/data/object1.png

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+[
+  {
+    "edit_instruction": "Combine these into a cohesive scene with natural perspective",
+    "id": "multi_002",
+    "images": [
+      "tasks/examples/image_edit/data/room_photo.png",
+      "tasks/examples/image_edit/data/object1.png",
+      "tasks/examples/image_edit/data/car_photo.png"
+    ],
+    "title": "Scene Composition"
+  }
+]

tasks/examples/image_edit/data/portrait.png

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+[
+  {
+    "id": "concept_001",
+    "prompt": "A modern minimalist office space with floor-to-ceiling windows, natural wood desk, ergonomic black chair, indoor plants, soft natural lighting, clean and organized workspace",
+    "theme": "Modern Office Space"
+  },
+  {
+    "id": "concept_002",
+    "prompt": "A cozy coffee shop interior with exposed brick walls, vintage pendant lights, wooden tables and chairs, barista counter with espresso machine, warm ambient lighting, people enjoying coffee",
+    "theme": "Cozy Coffee Shop"
+  },
+  {
+    "id": "concept_003",
+    "prompt": "A futuristic cityscape at night with neon lights, flying vehicles, towering skyscrapers with holographic advertisements, advanced architecture, cyberpunk aesthetic, rain-slicked streets",
+    "theme": "Futuristic City"
+  }
+]

tasks/examples/image_edit/data/room_photo.png

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+data_config:
+  source:
+    type: "disk"
+    file_path: "tasks/examples/text_to_image/concepts.json"
+
+graph_config:
+  nodes:
+    generate_variations:
+      node_type: llm
+      output_keys: images
+      prompt:
+        - user: |
+            {prompt}
+      model:
+        name: gpt_image_1
+        parameters:
+          n: 3
+
+  edges:
+    - from: START
+      to: generate_variations
+    - from: generate_variations
+      to: END
+
+output_config:
+  output_map:
+    id:
+      from: "id"
+    concept:
+      from: "concept_description"
+    images:
+      from: "images"