NetworkCapabilities: Embed location senstive TransportInfo

Changes:
i) Add a new constructor for NetworkCapabilities which accepts whether
location sensitive fields need to be parceled or not. Defalts to false
on the other constructor. This boolean should only be set on the copy of
NetworkCapabilities when sent to apps that hold location permission.
(Similar to how sensitive fields are handled in LinkProperties)
ii) Add a new makeCopy() method in the TransportInfo interface which
accepts whether location sensitive fields need to be parceled or not.
iii) Migrate the existing NetworkCapabilities owner UID masking to use
this new mechanism (instead of existing masking in ConnectivityService).
iv) Always set parcelLocationSensitiveFields to true in the NetworkAgent
surface (since that is a privileged surface from the transports to the
connectivity service)
v) Add a hasSensitiveFields() in TransportInfo interface to avoid
perfoming location permission checks for location insensitive
TrasnsportInfo.

Also, migrate to the new SdkLevel util for isAtLeastR() & isAtLeastS()
checks.

Bug: 162602799
Test: atest android.net
Test: atest com.android.server
Change-Id: Ie522d8c75a82ae521ccfd5165823d0c72642e651
Merged-In: Ie522d8c75a82ae521ccfd5165823d0c72642e651