FIR IDE: Add Add Import quickfix

This quickfix can import unresolved types and callables

It currently does not support Java types and is not as advanced as in
the old plugin

Also, enable tests that now pass

idea/testData/quickfix/autoImports/importNullableTraitWithGenerics.after.kt

@@ -0,0 +1,9 @@
+import importTrait.data.TestTrait
+
+// "Import" "true"
+// FIR_IGNORE
+// ERROR: Unresolved reference: TestTrait
+
+fun test() {
+    val a: TestTrait<String, Int>? = null
+}

idea/testData/quickfix/autoImports/importNullableTraitWithGenerics.before.Dependency.kt

@@ -0,0 +1,3 @@
+package importTrait.data
+
+interface TestTrait<A, B>

idea/testData/quickfix/autoImports/importNullableTraitWithGenerics.before.Main.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// FIR_IGNORE
+// ERROR: Unresolved reference: TestTrait
+
+fun test() {
+    val a: <caret>TestTrait<String, Int>? = null
+}

idea/testData/quickfix/autoImports/importTrait.after.kt

@@ -1,6 +1,7 @@
 import importTrait.data.TestTrait
 
 // "Import" "true"
+// IGNORE_FIR
 // ERROR: Unresolved reference: TestTrait
 
 fun test() {

idea/testData/quickfix/autoImports/importTrait.before.Main.kt

@@ -1,4 +1,5 @@
 // "Import" "true"
+// IGNORE_FIR
 // ERROR: Unresolved reference: TestTrait
 
 fun test() {

idea/testData/quickfix/autoImports/noImportForPrivateFunction.before.Dependency.kt

@@ -0,0 +1,3 @@
+package sometest
+
+private fun privateFun() {}

idea/testData/quickfix/autoImports/noImportForPrivateFunction.before.Main.kt

@@ -0,0 +1,8 @@
+// "Import" "false"
+// ACTION: Create function 'privateFun'
+// ACTION: Rename reference
+// ERROR: Unresolved reference: privateFun
+
+fun test() {
+    <caret>privateFun()
+}