Parameterize java_sdk_library by api scope

The java_sdk_library duplicated a lot of code related to api scopes and
also did a lot of switching on apiScope. This change eliminates that
duplication and switching by converting apiScope from an enum to a
structure containing api scope specific information.

It associates dependencies with corresponding scope by using a
scopeDependencyTag that contains a reference to the associated
apiScope.

Tested by:
1) Running the command below without the changes.
2) 'mv out/dist/apistubs $ANDROID_BUILD_TOP'
3) Applying these changes.
4) Running the command again.
5) Verifying that the out/dist/apistubs was identical to before the
   change using 'meld out/dist/apistubs $ANDROID_BUILD_TOP/apistubs'

Bug: 148080325
Test: m TARGET_PRODUCT=sdk TARGET_BUILD_VARIANT=userdebug dist sdk
      m droid
Change-Id: I0de3268b12254122e94ca83d09309b06ca2f9dbe