Review request for JMC-6492: Add unit support for jdk.jfr.Frequency

[Jie Kang]

Hi,

The attached patch adds a case for contentType "hertz",  annotation
"jdk.jfr.Frequency" used in JFR events like CPUTimeStampCounter, to
use the Hertz unit introduced in JMC-5768.

The following is a before and after image for the event browser for
CPUTimeStampCounter
https://imgur.com/a/cSVlmOM

How does it look?


Regards,
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