Timestamp Extension

[stephenberry]

This issue is to track the development of a Timestamp Extension for BEVE.

• It must work well with established formats.
• It must be easily representable in a common JSON time format.
• It must provide nanosecond accuracy.
• It must written in a way that is efficient to parse and serialize.

[stephenberry]

@meftunca, I want to tackle each extension proposal as a separate issue for BEVE. I know some of the time stuff is related, and that will be considered, but focusing on them individually will help narrow the discussion. Feel free to open more issues for your other extension proposals. The Timestamp is the first one that I want to implement.

[meftunca]

Of course I agree with you, proceeding step by step will be more efficient.