Remastering of documentation provider

- Remove whole file resolve
- Take already resolved element
- Get kotlin element behind the wrapper directly
- Remove outdated isKotlinDeclaration method
- More tests

idea/testData/editor/quickDoc/TopLevelMethodFromJava_Data.kt

@@ -0,0 +1,7 @@
+package some
+
+/**
+ * KDoc foo
+ */
+fun foo(bar: Int) {
+}