Improve remove/specify type intentions in Explicit API mode

Do not suggest to remove type for public declarations

 #KT-38915 Fixed

Do not show intention to specify type when corresponding quickfix is available

 #KT-39026 Fixed

idea/testData/intentions/removeExplicitTypeWithApiMode/.intention

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.intentions.RemoveExplicitTypeIntention

idea/testData/intentions/removeExplicitTypeWithApiMode/nonPublicFunction.kt

@@ -0,0 +1,4 @@
+// COMPILER_ARGUMENTS: -Xexplicit-api=strict
+// IS_APPLICABLE: true
+
+internal fun foo(): <caret>Int = 42

idea/testData/intentions/removeExplicitTypeWithApiMode/nonPublicFunction.kt.after

@@ -0,0 +1,4 @@
+// COMPILER_ARGUMENTS: -Xexplicit-api=strict
+// IS_APPLICABLE: true
+
+internal fun foo() = 42

idea/testData/intentions/removeExplicitTypeWithApiMode/publicFunction.kt

@@ -0,0 +1,4 @@
+// COMPILER_ARGUMENTS: -Xexplicit-api=strict
+// IS_APPLICABLE: false
+
+public fun foo(): <caret>Int = 42