chore: update .gitignore and requirements for development

- Added new entries to .gitignore to exclude temporary files and training input datasets, ensuring a cleaner repository.
- Included type stubs for psycopg2 in requirements-dev.txt to enhance type checking support for database interactions.
- Refactored the run_training_test.py script to implement a structured approach for loading and validating training input JSON files, improving the robustness of the training workflow.

scripts/inputs/linear_regression.json

@@ -0,0 +1,48 @@
+{
+  "experiment": {
+    "experiment_run_id": 1001,
+    "experiment_name": "test-experiment-name",
+    "run_name": "test-run-name",
+    "username": "vitor.santos@aignosi.com.br",
+    "status": "ORCHESTRATOR_WAITING_PROC"
+  },
+  "minio": {
+    "mc_alias": "suse",
+    "bucket_name": "model-training",
+    "file_name": "training-sample-dataset-1001.csv",
+    "local_csv": "input_dataset.csv"
+  },
+  "temporal": {
+    "task_queue": "train_model-basic-queue",
+    "workflow_name": "train_model",
+    "execution_timeout_minutes": 5,
+    "run_timeout_minutes": 5,
+    "task_timeout_minutes": 5
+  },
+  "payload": {
+    "experiment_run_id": 1001,
+    "variable_columns": ["Counter", "Rollout"],
+    "target_variable": "Square",
+    "line_separator": ",",
+    "decimal_separator": ".",
+    "train_size": 80,
+    "shuffle": true,
+    "random_state": 42,
+    "model_name": "smoke-linreg",
+    "model_type": "linear_regression",
+    "model_id": 1001,
+    "data_model_kwargs": {},
+    "model_kwargs": {},
+    "opt_params": {},
+    "date_column": "timestamp"
+  },
+  "db_only": {
+    "model_metadata": {
+      "schemas": {
+        "components": {
+          "schemas": {}
+        }
+      }
+    }
+  }
+}