ContextHubService: Pass nanoapp header data explicitly

Update to be compliant with the HIDL change to pass the nanoapp's binary
data via struct NanoAppBinary, which contains explicit fields parsed out
of the common nanoapp header, and the rest of the data after the header
passed separately.

Bug: 34182159
Test: run hello world context hub GTS test
Change-Id: I9e961c0f57567b3061302f193e4907332dcbad09