Add a workflow that automatically implements new syntax from ClickHouse

The desired workflow would run periodically (maybe once a day) and look something like this:

1. Pull all new test files from the ClickHouse/ClickHouse repo
2. `npm run generate:expected-ouputs` to generate expected explain outputs for the new test files
3. Delegate to an agent to make all of the tests pass
4. Open (or update an existing) PR with the changes

We might need a way for the agent to determine if the new syntax is just unsupported (eg. contains kql or another parser limitation). We might also need to timebox the execution or otherwise ensure that the agent doesn't spin forever.