Use asyncio to enable concurrency

[pranshu-raj-211]

Current operations are extremely slow. Since we're using synchronous programming and have multiple time consuming file and network operations, it's better to just use asyncio to run things concurrently.

This would mean changes like:

1. Using async function definitions
2. Using httpx instead of requests

Would need some time to figure out where exactly to make these improvements.
Also need to add metrics collection (time) and better logging.