GDScript: Add abstract methods

Co-authored-by: ryanabx <ryanbrue@hotmail.com>

modules/gdscript/tests/scripts/runtime/features/member_info_inheritance.out

@@ -1,24 +1,68 @@
 GDTEST_OK
-static var test_static_var_a1: Variant
-static var test_static_var_a2: Variant
+=== Class Properties ===
+--- A ---
+--- B ---
 static var test_static_var_b1: Variant
 static var test_static_var_b2: Variant
----
+--- C ---
+static var test_static_var_b1: Variant
+static var test_static_var_b2: Variant
+static var test_static_var_c1: Variant
+static var test_static_var_c2: Variant
+=== Member Properties ===
+--- B ---
 var test_var_b1: Variant
 var test_var_b2: Variant
-var test_var_a1: Variant
-var test_var_a2: Variant
----
+--- C ---
+var test_var_c1: Variant
+var test_var_c2: Variant
+var test_var_b1: Variant
+var test_var_b2: Variant
+=== Class Methods ===
+--- A ---
+--- B ---
+--- C ---
+=== Member Methods ===
+--- B ---
 static func test_static_func_b1() -> void
 static func test_static_func_b2() -> void
+func test_abstract_func_1() -> void
+func test_abstract_func_2() -> void
+func test_override_func_1() -> void
+func test_override_func_2() -> void
 func test_func_b1() -> void
 func test_func_b2() -> void
-static func test_static_func_a1() -> void
-static func test_static_func_a2() -> void
-func test_func_a1() -> void
-func test_func_a2() -> void
----
+abstract func test_abstract_func_1() -> void
+abstract func test_abstract_func_2() -> void
+func test_override_func_1() -> void
+func test_override_func_2() -> void
+--- C ---
+static func test_static_func_c1() -> void
+static func test_static_func_c2() -> void
+func test_abstract_func_1() -> void
+func test_abstract_func_2() -> void
+func test_override_func_1() -> void
+func test_override_func_2() -> void
+func test_func_c1() -> void
+func test_func_c2() -> void
+static func test_static_func_b1() -> void
+static func test_static_func_b2() -> void
+func test_abstract_func_1() -> void
+func test_abstract_func_2() -> void
+func test_override_func_1() -> void
+func test_override_func_2() -> void
+func test_func_b1() -> void
+func test_func_b2() -> void
+abstract func test_abstract_func_1() -> void
+abstract func test_abstract_func_2() -> void
+func test_override_func_1() -> void
+func test_override_func_2() -> void
+=== Signals ===
+--- B ---
+signal test_signal_b1()
+signal test_signal_b2()
+--- C ---
+signal test_signal_c1()
+signal test_signal_c2()
 signal test_signal_b1()
 signal test_signal_b2()
-signal test_signal_a1()
-signal test_signal_a2()