Add UICC file read operations
Looks like we can read files from the UICC with some messages in the UICC low level access service[1] but these are not currently available in libmbim.
This will allow us to propagate information about the SIM that is currently unavailable, such as EFGID1 and EFGID2, that will help us potentially determine when we are actually using an MVNO SIM card, etc. See [2] for more information: looks like EFGID1 has file ID 0x6F3E (28478) and EFGID2 has file ID 0x6F3F (28479).
[1] https://docs.microsoft.com/en-us/windows-hardware/drivers/network/mb-uicc-application-and-file-system-access [2] https://www.etsi.org/deliver/etsi_ts/131100_131199/131102/07.14.00_60/ts_131102v071400p.pdf