Add support for is_valid_before

[Alan-Jowett]

The uBPF fuzzer needs a version of the API that checks against the pre-conditions at the label instead of the post conditions.

Summary by CodeRabbit

• New Features
  • Added a new method to validate invariant states before a specific label, enhancing state verification capabilities.

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Walkthrough

The pull request introduces a new method is_valid_before to the Invariants class across two files. This method enables checking the validity of a state before a specified label, mirroring the existing is_valid_after functionality. The addition allows for pre-label state validation by constructing an abstract state and comparing it against the pre-invariant.

Changes

File	Change Summary
src/crab_verifier.hpp	Added public method bool is_valid_before(const label_t& label, const string_invariant& state) const to Invariants class
src/crab_verifier.cpp	Implemented is_valid_before method, constructing an abstract_state and comparing against pre-invariant

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[elazarg]

@Alan-Jowett any idea why the code coverage failed?

[Alan-Jowett]

Converting this to draft for now. Fuzzer integration is failing for reasons I don't understand yet.

[Alan-Jowett]

@Alan-Jowett any idea why the code coverage failed?

It looks like it's failing for all PRs.