pmc: convert native to jsonl and track TSC value of samples

• add '-j' options to filter to enable converting native pmc log format to json lines format to enable the use of scripts and external tooling

% pmc filter -j pmc.log pmc.jsonl

• Record the tsc value in sampling interrupts as opposed to recording nanotime when the sample is copied to a global log in hardclock - potentially many milliseconds later.

• At initialize record the tsc_freq and the time of day to give us an offset for translating the tsc values in callchain records