feat: Standard library functions can now be called with closure args #2471
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Description
Problem*
Progress towards #2334
Summary*
This PR adds a generic Env argument for all higher-order functions in stdlib, allowing them to be called with both closures and regular functions.
It also adds a few test cases for functions returning closures that are possible now that #2457 has been merged
Documentation
This PR requires documentation updates when merged.
Additional Context
PR Checklist*
cargo fmt
on default settings.