add: COSINE metric and text sparse search

[BenLocal]

• Added COSINE metric type for vector similarity search
• Added text sparse search
• upgrade milvus-proto to master version

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[sre-ci-robot]

Welcome @BenLocal! It looks like this is your first PR to milvus-io/milvus-sdk-rust 🎉

[mergify[bot]]

@BenLocal Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify[bot]]

@BenLocal Please associate the related issue to the body of your Pull Request. (eg. “issue: #187”)