Rename JvmPackageTable -> JvmModuleProtoBuf, PackageTable -> Module

This protobuf message is going to contain more information about the
module than just the table of package parts

compiler/testData/moduleProtoBuf/simple/BarMultiFilePart2.kt

@@ -0,0 +1,6 @@
+@file:JvmMultifileClass
+@file:JvmName("MultiBar")
+
+package bar
+
+fun multiFile2() {}