Introduce MultiModuleHighlightingTest

Checks that analysis produces expected diagnostics when configured by real IDEA module

idea/testData/multiModuleHighlighting/dependency/m1/m1.kt

@@ -0,0 +1,8 @@
+package foo
+
+public fun accessM1() {
+    accessM1()
+    accessM2()
+    <error>accessM3</error>()
+    <error>accessM4</error>()
+}

idea/testData/multiModuleHighlighting/dependency/m2/m2.kt

@@ -0,0 +1,8 @@
+package foo
+
+public fun accessM2() {
+    accessM1()
+    accessM2()
+    <error>accessM3</error>()
+    <error>accessM4</error>()
+}

idea/testData/multiModuleHighlighting/dependency/m3/m3.kt

@@ -0,0 +1,8 @@
+package foo
+
+public fun accessM3() {
+    <error>accessM1</error>()
+    accessM2()
+    accessM3()
+    <error>accessM4</error>()
+}

idea/testData/multiModuleHighlighting/dependency/m4/m4.kt

@@ -0,0 +1,8 @@
+package foo
+
+public fun accessM4() {
+    accessM1()
+    accessM2()
+    accessM3()
+    accessM4()
+}