Refactor BaseDataCollector to integrate ConnectionManager for connection handling

- Extracted connection management logic into a new `ConnectionManager` class, promoting separation of concerns and enhancing modularity.
- Updated `BaseDataCollector` to utilize the `ConnectionManager` for connection, disconnection, and reconnection processes, improving code clarity and maintainability.
- Refactored connection-related methods and attributes, ensuring consistent error handling and logging practices.
- Enhanced the `OKXCollector` to implement the new connection management approach, streamlining its connection logic.
- Added unit tests for the `ConnectionManager` to validate its functionality and ensure robust error handling.

These changes improve the architecture of the data collector, aligning with project standards for maintainability and performance.

data/common/__init__.py

@@ -10,7 +10,8 @@ from .data_types import (
     OHLCVCandle,
     MarketDataPoint,
     DataValidationResult,
-    CandleProcessingConfig
+    CandleProcessingConfig,
+    DataType
 )
 
 from .transformation.trade import (
@@ -44,6 +45,7 @@ __all__ = [
     'MarketDataPoint',
     'DataValidationResult',
     'CandleProcessingConfig',
+    'DataType',
     
     # Trade transformation
     'TradeTransformer',

data/common/data_types.py

@@ -10,8 +10,33 @@ from decimal import Decimal
 from typing import Dict, List, Optional, Any
 from dataclasses import dataclass, field
 from enum import Enum
+import asyncio
 
-from ..base_collector import DataType, MarketDataPoint  # Import from base
+# from ..base_collector import DataType, MarketDataPoint  # Import from base
+
+
+class DataType(Enum):
+    """Types of data that can be collected."""
+    TICKER = "ticker"
+    TRADE = "trade"
+    ORDERBOOK = "orderbook"
+    CANDLE = "candle"
+    BALANCE = "balance"
+
+
+@dataclass
+class MarketDataPoint:
+    """Standardized market data structure."""
+    exchange: str
+    symbol: str
+    timestamp: datetime
+    data_type: DataType
+    data: Dict[str, Any]
+    
+    def __post_init__(self):
+        """Validate data after initialization."""
+        if not self.timestamp.tzinfo:
+            self.timestamp = self.timestamp.replace(tzinfo=timezone.utc)
 
 
 @dataclass