Review use of expect/panic/assert/unwrap across the hyperlight codebase

[simongdavies]

Since hyperlight is a library the use of expect/panic/assert/unwrap especially in release builds is problematic since it use implies that we are happy to terminate the process, in most cases these usages should be turned into errors returned to the host program, the only cases where we should expect/panic/assert/unwrap are where we detect out of bounds memory access attempts or actions that would corrupt data.