JS BE: expose imported modules via $$importsForInline$$ property

... and use it as prefix to FQN in inline functions. This allows
to properly inline function declared in module A to module B,
when this function calls another function in module C.

See KT-18201

js/js.translator/testData/box/crossModuleRef/inlineModule.kt

@@ -0,0 +1,15 @@
+// EXPECTED_REACHABLE_NODES: 489
+// MODULE: lib1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: lib2(lib1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(lib1, lib2)
+// FILE: main.kt
+
+fun box() = bar()