infra: add script to capture replayable commands

[DavidKorczynski]

Giving https://github.com/google/oss-fuzz/pull/12592#issuecomment-2415803665 a go using bashlex

Will place a script in /out/replay-build-script.sh with the script that can be used for replaying.

This is still poc and will need some adjustments, e.g. we need some more handling on the bash script's ast to reason about loops.