Update climate.py

[Big-Szu]

Improved Asynchronous Handling:

Replaced blocking HTTP requests with non-blocking aiohttp requests for better performance and integration with Home Assistant's asynchronous framework.

Session Management:

Introduced a single aiohttp.ClientSession initialized in the __init__ method to avoid repeatedly creating new sessions, which can lead to resource exhaustion.
Added a close method to properly close the session when the component is unloaded.

Token Expiry Handling:

Added logic to detect expired tokens (HTTP 401) and automatically re-authenticate by fetching a new token and retrying the failed request.

Error Handling Enhancements:

Introduced detailed exception handling for network-related issues (aiohttp.ClientError) and JSON decoding errors to prevent the component from crashing and improve error logging.

Concurrency Protection:

Added an asyncio.Lock to ensure that multiple calls to async_update do not lead to race conditions when updating thermostat data.

Content Type Validation:

Enhanced the _get_data method to handle responses with text/html content type that contain valid JSON data, ensuring robust parsing.

Code Refactoring for Logging:

Improved logging by providing more detailed and descriptive messages, including response status and error details, while avoiding logging sensitive data (e.g., tokens).