Add SharedMemory.fromFileDescriptor

- Rename existing SharedMemory.create and make it public
- Passed file is now detached after creating shared memory and is
  not usable any more.

Bug: 188780895
CTS-Coverage-Bug: 197226773
Test: atest com.android.car.internal.test.LargeParcelableJavaStableAIDLTest
      (runs only in auto. will add matching CTS tests for non-auto devices)

(This combines two CL in internal tree, so Change-Id and Merged-In id are
different)
Change-Id: I8a634062d10ff0c114f3add1d2a5e8056f17b788
Merged-In: I11381e78580b97982b25a52aa06f2192def7353f