[Enhancement]: Support _async parameter for query()

[yhmo]

Is there an existing issue for this?

• I have searched the existing issues

What would you like to be added?

Add _async parameter for query() interface, just like the other interfaces such as search/insert/load

Currently, the query() always wait the result:

pymilvus/pymilvus/client/grpc_handler.py

Line 1539 in 3110139

response = future.result()

Why is this needed?

No response

Anything else?

No response

[yhmo]

We can create a new class AsyncMilvusClient to support python native async/await interfaces.

The pymilvus/asyncio/client/grpc_handler.py in this pr could be helpful:
https://github.com/milvus-io/pymilvus/pull/1273/files