Generated classes with Dispose should generate finalizer

[jasoncouture]

Brief Description

For the classes that generate a dispose method, they should also have a finalizer. Without a finalizer, the code can leak handles when it's collected by the gc without freeing the handle.

Proposed generation output;

~ClassName() => Dispose(false);
// Private if the class is sealed, protected virtual if it is not.
protected virtual void Dispose(bool disposing)
{
    Marshal.FreeHGlobal(...);
    if(disposing) GC.SurpressFinalize(this);
}
public void Dispose() => Dispose(true);

If I have some free time soon I'll put up a pr for this.

The GC.SupressFinalize(this) call will prevent the finalizer from running when disposed properly, otherwise the gc will run the finalizer and free the pointer. This will prevent a handle leak by always making sure the handle is freed. (Non os specific, code generation)

OS: N/A