minify-html/bench/runners

Benchmark runners

• Each directory should have an executable ./build and ./run.
• The runners should use the following environment variables:
  • MHB_ITERATIONS: times to run each input.
  • MHB_INPUT_DIR: path to directory containing inputs. Files should be read from this directory and used as the inputs.
  • MHB_HTML_ONLY: if set to 1, minify_css and minify_js should be disabled.
• The output should be a JSON array of pairs, where each pair represents the input name and execution time in seconds (as a floating point value).
  • The execution time should be measured using high-precision monotonic system clocks where possible.