Perf/lazy libcst load

[shrutu0929]

solve #142
The recent commit enhances the performance characteristics of the SyntaxVerifier module by mitigating unnecessary initialization overhead along the verification hot-path. We restructured the heavy dependency on libcst by moving it out of the iterative evaluation loop and into a module-level global cache retriever, guaranteeing that libcst is only lazily loaded into execution memory upon the very first instance it is definitively required. Furthermore, the _find_dangerous_calls and _count_imports analytical routines were retrofitted to adopt the globally shared AST structures passed through the system's VerificationContext object. By directly inheriting this pre-compiled syntax tree, we avert redundant and expensive parsing cycles on identical files, effectively minimizing memory footprints and significantly decreasing validation times across large, complex codebases.

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Reviewing files that changed from the base of the PR and between c89cfdb and 993796c.

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• refactron/verification/checks/syntax.py

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