Add the possibility to run binaries instead of libfuzzer harnesses

Some software (like `tar`, `jq`, `vim`, ...) are ~~too cursed~~ not designed as a library and thus can't easily (or even at all) be shoehorned into a libfuzzer harness, yet are not only used a lot but are prime targets of some [popular exploit acquisition programs]( https://zerodium.com/program.html ).

It would be nice to be able to fuzz them :)

The issue names no files, tests, or entry points. Start by examining how OSS-Fuzz currently runs libFuzzer harnesses, then compare that with the listed binary targets such as tar, jq, and vim; done means a supported way to fuzz binaries without library harnesses.

Written by the indexing model from the issue text.