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".

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

@@ -0,0 +1,16 @@
+var _prop = 1
+var prop:
+	get = get_prop, set = set_prop
+
+func get_prop():
+	return _prop
+
+func set_prop(value):
+	_prop = value
+
+func test():
+	print(prop)
+
+	prop = 2
+
+	print(prop)

modules/gdscript/tests/scripts/analyzer/features/property_functions.out

@@ -0,0 +1,3 @@
+GDTEST_OK
+1
+2

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)

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

@@ -0,0 +1,10 @@
+GDTEST_OK
+null
+0
+1
+2
+
+1
+2
+3
+4