Add Milvus chart

[jeffoverflow]

Signed-off-by: quicksilver zhifeng.zhang@zilliz.com

What this PR does / why we need it: Add Milvus chart to https://developer.aliyun.com/hub Special notes for your reviewer:

If applicable:

• [x] this PR contains documentation (是否包含文档)
• [x] this PR contains unit tests (是否包含测试、实际环境有效性验证)
• [x] this PR has been tested for backwards compatibility (是否向后兼容)

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