Extract common logic for annotation entries collection

Before this change annotation entries starting with '@' within expressions hadn't been resolved

Note that order of annotation entries in result may change according to order of children in PSI (see changed testData)

compiler/testData/diagnostics/tests/annotations/atAnnotationResolve.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+annotation class Ann(val x: Int = 6)
+
+@Ann(1) [Ann(2)] @Ann(3) @private class A [Ann] () {
+    @Ann(x = 5) fun foo() {
+        1 + @Ann(1) 1 * @Ann(<!TYPE_MISMATCH!>""<!>) 6
+
+        @Ann fun local() {}
+    }
+
+    @Ann val x = 1
+
+    fun bar(x: @Ann(1) [Ann(2)] @Ann(3) Int) {}
+}

compiler/testData/diagnostics/tests/annotations/atAnnotationResolve.txt

@@ -0,0 +1,19 @@
+package
+
+Ann(x = IntegerValueType(1): IntegerValueType(1)) Ann(x = IntegerValueType(2): IntegerValueType(2)) Ann(x = IntegerValueType(3): IntegerValueType(3)) private final class A {
+    Ann() public constructor A()
+    Ann() internal final val x: kotlin.Int = 1
+    internal final fun bar(/*0*/ x: [Ann(x = IntegerValueType(1): IntegerValueType(1)) Ann(x = IntegerValueType(2): IntegerValueType(2)) Ann(x = IntegerValueType(3): IntegerValueType(3))] kotlin.Int): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    Ann(x = IntegerValueType(5): IntegerValueType(5)) internal final fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+internal final annotation class Ann : kotlin.Annotation {
+    public constructor Ann(/*0*/ x: kotlin.Int = ...)
+    internal final val x: kotlin.Int
+    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 open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}