Add some friendly error messages for java_sdk_library.

The stubs will always fail to build without at least these
three arguments. Give a clear error message when this happens
instead of failing further into the build.

Bug: 77575606
Test: make <x>.stubs for sdk_library "x" without these args
Change-Id: If3142ecc73d6428f7e3120788f8de64d56a777ad