Improve profiling output when duration filter is specified

In particular:

  - Use strict inequality for comparisons, since that's what the filter
    syntax supports.

  - Convert to millis for comparisons, since that's the unit used both
    for the filter and when printing.

Now something like `RA_PROFILE='*>0'` will only print things that took
at least 1ms (when rounded to millis).

Signed-off-by: Michal Terepeta <[email protected]>

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