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Summary: Adds a Python function `PEEK()` for use in formulas which temporarily sets a new attribute `Engine._peeking` which disables the `_use_node` method, preventing dependency tracking and allowing the given expression to use outdated values. This allows circumventing circular reference errors. It's particularly meant for trigger formulas although it works in normal formulas as well. The expression is wrapped in a `lambda` by `codebuilder` for lazy evaluation. Discussion: https://grist.slack.com/archives/C0234CPPXPA/p1653571024031359 Test Plan: Added a Python unit test for circular trigger formulas using PEEK. Reviewers: dsagal Reviewed By: dsagal Subscribers: paulfitz Differential Revision: https://phab.getgrist.com/D3453