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
Since inference isn't always correct, they are now treated as unsafe
instead of errors.
This also removes inferred type when a variable is reassigned. Since
it's not aware of branching, the types might become invalid in a later
context.
The test generation doesn't initialize the language (since it's already
initialized in main), but it still needs the warning enabled so it
matches the actual tests.
