[Enhancement]: Support reading credentials of dependencies from Env or file

[haorenfsa]

Is there an existing issue for this?

• I have searched the existing issues

What would you like to be added?

Support reading credentials of dependencies (S3, Pulsar, Kafka, Etcd) from Environment variable or a secret file

Why is this needed?

Better Security.

Anything else?

Related issue:

• Allow reading credentials from secrets zilliztech/milvus-helm#140
• [Security] Store kafka credential in configmap zilliztech/milvus-helm#128

[stale]

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