Add nanosecond support for timestamps for versions prior to .NET 7

[mishamyte]

Discussed in #247

^{Originally posted by danielhuntleyalpine January 29, 2024}
When using this package with versions earlier than .net 7, timestamps are published to the closest ms rather than the nanosecond. This is a request to add support for micro and nano seconds similar to how we handle .net7 and later versions.

I can appreciate that the Microsecond and Nanosecond functions aren't available in earlier versions but we should still be able to obtain that information from the ticks.

Any help on this would be greatly appreciated! Thanks for taking the time to consider this request.

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