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.txt

@@ -0,0 +1,12 @@
+package
+
+public fun kotlin.String.method1(): kotlin.String
+
+public final class ClassA {
+    public constructor ClassA()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final fun method1(): ClassA
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    public final fun kotlin.String.method2(): kotlin.Unit
+}