Add configurable AFL++ timeout to orchestration script

[erickcestari]

I also noticed that the orchestration script doesn't have an option to configure the -t value and instead uses AFL++'s default. Running without an increased timeout can cause the fuzzer to time out on inputs, especially the longer ones that are capable of opening channels.

  -t msec       - timeout for each run (auto-scaled, default 1000 ms). Add a '+'
                  to auto-calculate the timeout, the value being the maximum.

Originally posted by @erickcestari in #135 (comment)