add some basic parsing benchmarks

This adds some simple benchmarks to test the speed of
evtclib::process_{file,stream}, just so we can quickly assess on a
high-level if changes make a big impact.

I'd like to add some more benchmarks in the future as well, mostly
- on the higher level when we go from RawEvtc to a log, benchmarking the
  process function itself (thus not benchmarking all the byte-twiddling
  deserialization code).
- on the Analyzer level

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