Add four new benchmark scripts (maps.lua, maps.py, maps.rb, maps.wren) that measure
hash map insertion, lookup, and deletion performance across 100,000 elements.
Register the new "maps" benchmark in run_bench.py with expected output 5000050000.
- Relocate benchmark/run_bench to script/run_bench.py
- Replace WREN_DIR with HOME_DIR and update BENCHMARK_DIR construction
- Change wren binary path from relative "../wren" to absolute using HOME_DIR