Adds MRENCLAVE extractor tool

[italo-sampaio]

Adds a middleware utility that extracts the MRENCLAVE value from a signed enclave binary.

[amendelzon]

We need some unit tests. At least of the core logic classes. Also, would you be able to put all this under an sgx module? And potentially split into separate files to have smaller modules. Thanks.

[italo-sampaio]

We need some unit tests. At least of the core logic classes. Also, would you be able to put all this under an sgx module? And potentially split into separate files to have smaller modules. Thanks.

Sounds good. I'll add the unit tests and split into smaller modules. Marking this as a drat in the meantime

[amendelzon]

This deserves a module of its own I would think. And we don't need to unit test the main, just this class should be enough.

[italo-sampaio]

We decided to change the approach to a script that calls into oesign: #221