Export Wifi Parcelables AIDLs from framework.jar

Add Wifi public/@SystemApi Parcelable AIDLs to
framework.jar AIDL exports so that they can be
referenced outside the Wifi module.

Create a new folder "aidl-export" to separate
the AIDLs we want to export to allow external
callers to reference in their AIDL. Private AIDLs
remain in the "java" folder.

most of modifications cherry-pick from internal master
(ag/10139892), but slight change for Android.bp to be
able to compile in aosp build system. keeping the same
aidl path as master to find the correct path when importing
ScanResult from wifi.

Bug: 140299412
Bug: 137835398
Test: atest FrameworksWifiTests

Merged-In: I4e0dc1119bf2b49865c9b5cdf23c571528228902
Change-Id: Idaae4f365e4efaead023ee175391a9e9432a6e00