Get rid of get file path by using the data.json convention to store the challenge information (#67)

Signed-off-by: Merwane Hamadi <merwanehamadi@gmail.com>

agbenchmark/tests/basic_abilities/write_file/data.json

@@ -0,0 +1,22 @@
+{
+  "name": "basic_write_file",
+  "category": ["basic"],
+  "task": "Print the the capital of America to a .txt file",
+  "dependencies": [],
+  "ground": {
+    "answer": "Washington",
+    "should_contain": ["Washington"],
+    "should_not_contain": ["New York", "Los Angeles", "San Francisco"],
+    "files": [".txt"],
+    "type": "file"
+  },
+  "mock": {
+    "mock_func": "basic_write_file_mock",
+    "mock_task": "What is the capital of America?"
+  },
+  "info": {
+    "difficulty": "basic",
+    "description": "Tests the writing to file",
+    "side_effects": ["tests if there is in fact an LLM attached"]
+  }
+}