Hi team, First of all thank you for open sourcing the support of AIPs, it's amazing work. I have a question about the [AIP-160](https://google.aip.dev/160) Filtering AIP. It seem, that you don't support the dot notation for traversal operator (`a.b.c = "foo"`). I'd appreciate any your suggestions where to take a look in order to add it? If it's even possible in your code structure? Thanks and have a great day!