Change resolution priority about implicit receivers and synthesized member-like descriptors.

Change resolution to consider extensions to implicit receiver before members of another implicit receiver.
Make synthesized member-like extensions resolve right after the members.

#KT-10510 Fixed
#KT-10219 Fixed

compiler/testData/diagnostics/tests/resolve/priority/kt10510.kt

@@ -0,0 +1,13 @@
+// !CHECK_TYPE
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_PARAMETER -UNUSED_VARIABLE
+
+class ClassA {
+    fun method1() = this
+
+    fun String.method2() {
+        method1() checkType { _<String>() }
+        this.method1() checkType { _<String>() }
+    }
+}
+
+fun String.method1() = this