Refactor and utilize custom tls client

Updated code to correctly format and write products to JSON file.

Performance Improvements:

• Moved regex compilation to package level (only compiled once)
• Added a custom HTTP client with proper timeouts and connection pooling
• Used buffer pool to reduce memory allocations
• Used io.Copy instead of ioutil.ReadAll for better memory efficiency

Reliability Improvements:

• Added context with timeout
• Added status code checking
• Implemented exponential backoff retry mechanism
• Better error handling with wrapped errors

Code Quality Improvements:

• More descriptive error messages
• Structured logging with additional context
• Better resource cleanup with defers
• Consistent error message formatting