Add "expectedBy" to module descriptor and use it in checker

Now ExpectActualDeclarationChecker in IDE context
uses common module descriptors for relevant checks.
Compiler still uses own module instead (see comment in checker)
So #KT-21771 Fixed

idea/testData/multiModuleHighlighting/multiplatform/triangleWithDependency/common_base/My.kt

@@ -0,0 +1 @@
+expect class My

idea/testData/multiModuleHighlighting/multiplatform/triangleWithDependency/common_derived/foo.kt

@@ -0,0 +1 @@
+expect fun foo(my: My)

idea/testData/multiModuleHighlighting/multiplatform/triangleWithDependency/jvm_derived/impl.kt

@@ -0,0 +1,3 @@
+class <error descr="[ACTUAL_MISSING] Declaration must be marked with 'actual'">My</error>
+
+actual fun foo(my: My) {}