GDScript: Report property type errors

Inline getters & setters are now FunctionNodes.
Their names are set in the parser, not in the compiler.
GDScript-Analyzer will now run through getter and setter.
Also report wrong type or signature errors regarding getset properties.
Added GDScript tests for getters and setters.
#53102

modules/gdscript/tests/scripts/analyzer/features/property_inline.gd

@@ -0,0 +1,46 @@
+# Untyped inline property
+var prop1:
+	get:
+		return prop1
+	set(value):
+		prop1 = value
+
+# Typed inline property
+var prop2 : int:
+	get:
+		return prop2
+	set(value):
+		prop2 = value
+
+# Typed inline property with default value
+var prop3 : int = 1:
+	get:
+		return prop3
+	set(value):
+		prop3 = value
+
+# Typed inline property with backing variable
+var _prop4 : int = 2
+var prop4: int:
+	get:
+		return _prop4
+	set(value):
+		_prop4 = value
+
+func test():
+	print(prop1)
+	print(prop2)
+	print(prop3)
+	print(prop4)
+
+	print()
+
+	prop1 = 1
+	prop2 = 2
+	prop3 = 3
+	prop4 = 4
+
+	print(prop1)
+	print(prop2)
+	print(prop3)
+	print(prop4)