Benchmark ergonomics

[daun]

A few tweaks to the bin/benchmark scripts.

• Shortened script names (less typing 🥳)
• Increase memory limit (couldn't get it to run otherwise)
• Clear index before indexing using new method
• Add command line options for
  • Limiting the amount of movies to index --limit=1000
  • Re-inserting all existing documents to test update performance: --update
  • Changing the search query term --query="lorem ipsum"
  • Debugging the search results --debug
• Display search runtime in ms instead of s
• Reordered time vs. memory (I figured time's more relevant most of the time)
• Add newline at the end to avoid php adding a % after each run

[Toflar]

Thanks, Philipp!