FIR IDE: Add visibility checks to the completion

Visibility checks currently do not work in some cases, for example:

- public nested class of private class is seen globally
- private_for_this does not work
- some other cases I am not yet aware of

If `FirVisibilityChecker.isVisible` fix those issues, they will be fixed
automatically in the completion

idea/idea-completion/testData/basic/common/visibility/VisibilityClassMembersFromExternal.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class Some() {
     public val testPublic = 12
     protected val testProtected = 12

idea/idea-completion/testData/basic/common/visibility/VisibilityInSubclass.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class Some() {
     public val testPublic = 12
     protected val testProtected = 12

idea/idea-completion/testData/basic/common/visibility/VisibilityOfClassMembersFromLocalClassConstructor.kt

@@ -0,0 +1,19 @@
+// FIR_COMPARISON
+package test
+
+open class Base {
+    public val testPublic = 12
+    protected val testProtected = 12
+    private val testPrivate = 12
+    val testPackage = 12
+
+    fun baseClassMember() {
+        class Local {
+            init {
+                <caret>
+            }
+        }
+    }
+}
+
+// EXIST: testPublic, testProtected, testPackage, testPrivate

idea/idea-completion/testData/basic/common/visibility/VisibilityOfClassMembersFromLocalClassMember.kt

@@ -0,0 +1,19 @@
+// FIR_COMPARISON
+package test
+
+open class Base {
+    public val testPublic = 12
+    protected val testProtected = 12
+    private val testPrivate = 12
+    val testPackage = 12
+
+    fun baseClassMember() {
+        class Local {
+            fun localClassMemeber() {
+                <caret>
+            }
+        }
+    }
+}
+
+// EXIST: testPublic, testProtected, testPackage, testPrivate

idea/idea-completion/testData/basic/common/visibility/VisibilityOfCompanionObjectMembersFromOutside.kt

@@ -0,0 +1,27 @@
+// FIR_COMPARISON
+package test
+
+open class BaseClass {
+    companion object {
+        val publicVal = 10
+        fun publicFun() {}
+
+        protected val protectedVal = 30
+        protected fun protectedFun() {}
+
+        private val privateVal = 30
+        private fun privateFun() {}
+    }
+}
+
+fun test() {
+    BaseClass.<caret>
+}
+
+// EXIST: publicVal
+// EXIST: publicFun
+
+// ABSENT: protectedVal
+// ABSENT: protectedFun
+// ABSENT: privateVal
+// ABSENT: privateFun

idea/idea-completion/testData/basic/common/visibility/VisibilityOfCompanionObjectMembersFromSubclass.kt

@@ -0,0 +1,29 @@
+// FIR_COMPARISON
+package test
+
+open class BaseClass {
+    companion object {
+        val publicVal = 10
+        fun publicFun() {}
+
+        protected val protectedVal = 30
+        protected fun protectedFun() {}
+
+        private val privateVal = 30
+        private fun privateFun() {}
+    }
+}
+
+class Subclass : BaseClass() {
+    fun test() {
+        BaseClass.<caret>
+    }
+}
+
+// EXIST: publicVal
+// EXIST: publicFun
+// EXIST: protectedVal
+// EXIST: protectedFun
+
+// ABSENT: privateVal
+// ABSENT: privateFun