Add detailed debug logging to enclave handshaker
Add detailed debug logging to enclave handshaker

This adds debug logging to the tsi_enclave_handshaker_create() function
to print out information provided for configuring the handshaker.
Previously, these logs existed at other layers. However, since these
arguments are only used at the tsi_handshaker level, it is more
appropriate to log this information here.

Sample output:
I0515 15:28:25.426223477    5959 enclave_transport_security.cc:391] tsi_enclave_handshaker_create(is_client=0, self_assertions=0x7fe77fc77aa0, accepted_peer_assertions=0x7fe77fc77ab0, additional_authenticated_data=0x7fe77fc77a90, handshaker=0x7ffc8520e548)
D0515 15:28:25.426254263    5959 enclave_transport_security.cc:403] additional authenticated data: EKEP server
D0515 15:28:25.426372735    5959 enclave_transport_security.cc:410] self assertion: (identity_type: NULL_IDENTITY authority_type: "Any")
D0515 15:28:25.426397128    5959 enclave_transport_security.cc:415] accepted peer assertion: (identity_type: NULL_IDENTITY authority_type: "Any")

PiperOrigin-RevId: 196848462

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo