FIO-9783: refactor evaluator

[brendanbond]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9783

Description

We've identified a bottleneck in the way we perform form validation in our Enterprise Server - creating VM contexts per request and executing the entire form orchestration pipeline in those contexts turns out to be kind of slow and expensive. To mitigate this, I've changed the way the Evaluator class is leveraged: instead of a static singleton class, it is now a mutable class instance that can be extended and overridden as needed, giving us access to things like constructors.

On a granular level, this PR:

• removes the modules export and moves the Evaluator (formerly the JSONLogicEvaluator) into utilities;
• encapsulates repeated evaluation and interpolation code (e.g. normalizing the context, etc.) into two convenience utility functions, evaluate and interpolate for use in the processors and elsewhere;
• normalizes the context into only the values we can guarantee (previously we were passing the entire context into these evaluation contexts, which would mean that advanced evaluations would have access to/be able to mutate things like processor functions, etc.); and
• adds an asynchronous version of the clearHidden processor, the lack of which I think was an oversight.

Breaking Changes / Backwards Compatibility

This introduces a fair amount of risk (although tests are passing) but there are certainly not any intentional breaking changes in this PR.

Dependencies

n/a

How has this PR been tested?

Tests are passing.

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above

[travist]

Nice refactor!