[FEATURE]: AsyncMilvusClient Missing has_collection() Method

[SwAt1563]

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Description:
When using pymilvus, I noticed that AsyncMilvusClient does not have the has_collection() method, whereas MilvusClient does.

Steps to Reproduce:

from pymilvus import AsyncMilvusClient

client = AsyncMilvusClient()
# Attempting to check for a collection
client.has_collection("my_collection")  # AttributeError: 'AsyncMilvusClient' object has no attribute 'has_collection'

Expected Behavior:

AsyncMilvusClient should have a has_collection() method similar to MilvusClient, or an equivalent alternative should be documented.

Environment:

• pymilvus version: 2.5.5

Additional Context:

Is there an alternative way to check for collection existence in AsyncMilvusClient, or is this a missing feature?

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Anything else?

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