Initial C library for libbinder.

This creates a simple wrapper around libbinder with a stable C ABI. It
also embeds the concept of an IBinder and IBinder transactions into the
ABI so that parts of their transactions can be changed and considered
implementation details of libbinder. With this basic class, you can
create a service, use it with primitive data types, but it does not yet
suppport the entire range of binder objects.

Follow-up items to handle/things still to consider
- b/112664205: make aidl-gen produce interfaces that use these (and
    think about interoperation with existing interfaces).
- using onServiceConnected/onServiceDisconnected in the NDK
- if libbinder/libbinder_ndk classes use the same descriptor, there will
  be problems in the same process (libbinder{_ndk} assumes binder class)
- sometimes getService takes 1s since there is a race for it getting
  registered
- add generic class which allows for easy implementation of a class like
  IFoo in this test.
- Parcel for additional types (and additional APIs, like data available)
- addition of APIs like AIBinder_ping/linkToDeath which all binders have
- embed Status into this API layer (so EX_HAS_REPLY_HEADER is handled)
- make remoteBinder/localBinder is const (and therefore isRemote)
- okay with associateClass or should just use interfaceDescriptor
- potentially changing out incStrong/decStrong
- adding @file/@addtogroup to comments

Bug: 111445392
Test: ndk/runtests.sh

Change-Id: Ifbca8f0fdf70a3213fe0d94320fc31eeb62408c4

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