add function to create expected outputs for deterministic tests

[ansalma6]

PR for #11

Added a function in wasmtest.sh file for creating expected outputs.
The function can be ran using "wasmtest.sh createexpected" or "wasmtest.sh ce"

All c files under each of the deterministic subfolder are taken and compiled using gcc.
A new folder expected is created in each deterministic subfolder and the output is saved in a <test_case_filename>.output file
If there are any compile or runtime error, they are displayed in the console and alse added to the .output file.
The compiled files are deleted after running
Finally a count of total/success/failure is displayed in the console

[Yaxuan-w]

I was wondering if we might consider adding a cleanup as an optional feature as well. Since we will create a subfolder for each deterministic category, manually cleaning them up could become messy.

Would it be possible to include something like wasmtest.sh cleanup or wasmtest.sh cl, to remove all the /expected folders and their contents?

[ansalma6]

Changes from Review comments:
Added a new function to cleanup the generated expected outputs and testlists "wasmtest.sh cleanexpected" or "wasmtest.sh cle"
Added comment headers for functions
Outputs the paths of successful tests to testlist_safe.txt and failed tests to testlist_unsafe.txt (one file per line)

Note:
Renamed the function to generate expected outputs to avoid potential confusion with cleanup arguments.
"wasmtest.sh generateexpected" or "wasmtest.sh ge"

[rennergade]

This looks good, agree with the previous comments. @yashaswi2000 We should probably try to cache these expected outputs though since they shouldnt change.

[m-hemmings]

Looks good after my suggestions were discussed. Thank you.

[Yaxuan-w]

LGTM