[Feature]: Implement Timestamp Data Type in Milvus

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Timestamps are crucial for a wide range of applications including time-series data analysis, event tracking, and log management among others. By introducing a timestamp data type, Milvus can broaden its use case coverage and provide better service to applications that are time-sensitive. This enhancement will involve the design and implementation of the timestamp data type, ensuring its correct representation, and providing efficient querying capabilities based on time. Further, it will be necessary to create comprehensive documentation and examples to guide users on how to utilize this new data type effectively in their Milvus-based applications. This feature will significantly improve Milvus’s capability in handling time-oriented data and open new avenues for real-world applications.

You have to implement timestamp data type and finish at least one SDK (Go, Java, Python) support too

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