JS: Add Public module and only expose that

Indentation will be fixed in next commit

javascript/ql/lib/semmle/javascript/BasicBlocks.qll

@@ -1 +1 @@
-import internal.BasicBlockInternal
+import internal.BasicBlockInternal::Public

javascript/ql/lib/semmle/javascript/internal/BasicBlockInternal.qll

@@ -110,6 +110,9 @@ BasicBlock immediateDominator(BasicBlock bb) = idominance(entryBB/1, succBB/2)(_
 cached
 BasicBlock immediatePostDominator(BasicBlock bb) = idominance(exitBB/1, predBB/2)(_, result, bb)
 
+import Public
+
+module Public {
 /**
  * A basic block, that is, a maximal straight-line sequence of control flow nodes
  * without branches or joins.
@@ -359,3 +362,5 @@ class ReachableJoinBlock extends ReachableBasicBlock {
     )
   }
 }
+
+}