add C strace-grate

[drapl0n]

This PR adds C strace grate. I have currently disabled handler registration for exec and clone syscalls.

Compile using:

lind_compile --compile-grate strace_grate.c strace.c

[stupendoussuperpowers]

1. Can you follow the directory structure of imfs_grate and geteuid_grate as well? i.e. place all the .c/.h files in src/, and add a compile script which will place the .wasm/.cwasm files in output/?

2. Does this convert arguments to strings as well or is that a TODO?

[drapl0n]

1. Can you follow the directory structure of imfs_grate and geteuid_grate as well? i.e. place all the .c/.h files in src/, and add a compile script which will place the .wasm/.cwasm files in output/?

Latest version of lind_compile has a flag that facilitates compilation of the grate and copies pre-compiled binary to lindfs, which i think is pretty streamlined.

Does this convert arguments to strings as well or is that a TODO?

Yes, it does convert syscall arguments with type ARG_STR into a string.