Asynchronous version of read_database

[alkment]

Description

While it is possible to pass an asynchronous connection to pl.read_database, the action performed will be blocking. It would be great if we could actually async reads. That way a DB or multiple DBs could work on multiple queries at the same time.

Here is an example of what I mean:

import asyncio
from sqlalchemy.ext.asyncio import create_async_engine

async_engine = create_async_engine("sqlite+aiosqlite:///test.db")

async def main():
      t1=asyncio.create_task(pl.read_database_async(
          query="SELECT * FROM test_data_1", 
          connection=async_engine,
      ) )
      t2=asyncio.create_task(pl.read_database_async(
          query="SELECT * FROM test_data_2", 
          connection=async_engine,
      ) )
      df1=await t1
      df2=await t2
      return (df1,df2)

df1,df2=asyncio.run(main())