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/errors/property_function_get_type_error.gd

@@ -0,0 +1,11 @@
+var _prop : int
+
+# Getter function has wrong return type.
+var prop : String:
+	get = get_prop
+
+func get_prop():
+	return _prop
+
+func test():
+	pass

modules/gdscript/tests/scripts/analyzer/errors/property_function_get_type_error.out

@@ -0,0 +1,2 @@
+GDTEST_ANALYZER_ERROR
+Function with return type "int" cannot be used as getter for a property of type "String".

modules/gdscript/tests/scripts/analyzer/errors/property_function_set_type_error.gd

@@ -0,0 +1,11 @@
+var _prop : int
+
+# Setter function has wrong argument type.
+var prop : String:
+	set = set_prop
+
+func set_prop(value : int):
+	_prop = value
+
+func test():
+	pass

modules/gdscript/tests/scripts/analyzer/errors/property_function_set_type_error.out

@@ -0,0 +1,2 @@
+GDTEST_ANALYZER_ERROR
+Function with argument type "int" cannot be used as setter for a property of type "String".

modules/gdscript/tests/scripts/analyzer/errors/property_inline_get_type_error.gd

@@ -0,0 +1,9 @@
+var _prop : int
+
+# Inline getter returns int instead of String.
+var prop : String:
+	get:
+		return _prop
+
+func test():
+	pass

modules/gdscript/tests/scripts/analyzer/errors/property_inline_get_type_error.out

@@ -0,0 +1,2 @@
+GDTEST_ANALYZER_ERROR
+Cannot return value of type "int" because the function return type is "String".

modules/gdscript/tests/scripts/analyzer/errors/property_inline_set_type_error.gd

@@ -0,0 +1,9 @@
+var _prop : int
+
+# Inline setter assigns String to int.
+var prop : String:
+	set(value):
+		_prop = value
+
+func test():
+	pass

modules/gdscript/tests/scripts/analyzer/errors/property_inline_set_type_error.out

@@ -0,0 +1,2 @@
+GDTEST_ANALYZER_ERROR
+Cannot assign a value of type "String" to a target of type "int".