Add batch-runner.js for running batch SQL scripts with timing info.

FossilOrigin-Name: 11f3ed61150c5940da6c157e5063e70c3aa0628dfd0023c47bb65b00af74ab1f

ext/wasm/split-speedtest1-script.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Expects $1 to be a (speedtest1 --script) output file. Output is a
+# series of SQL files extracted from that file.
+infile=${1:?arg = speedtest1 --script output file}
+testnums=$(grep -e '^-- begin test' "$infile" | cut -d' ' -f4)
+#echo testnums=$testnums
+for n in $testnums; do
+  ofile=$(printf "speedtest1-%03d.sql" $n)
+  sed -n -e "/^-- begin test $n\$/,/^-- end test $n\$/p" $infile > $ofile
+  echo -e "$n\t$ofile"
+done