[Bug]: never cache collection info by aliasName

[PowderLi]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: master
- Deployment mode(standalone or cluster): both
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

https://github.com/milvus-io/milvus/blob/master/internal/proxy/meta_cache.go#L379

1. client request with collectionName = alias0
2. proxy describeCollection(alias0) from rootcoord
3. rootcoord return collecitonInfo with collectionName & schema.Name = coll0
4. proxy update meta collInfo[][coll0] = collectionInfo rather than collInfo[][alias0] = collectionInfo

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[yanliang567]

/assign @PowderLi
/unassign

[stale]

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