Add new stdlib::has_function function to test for function availability.
Additional Context
The old is_function_available function was deprecated for quite some time and removed.
It did not support testing for availability of modern functions, only 3.x style. This new
function fully supports the various types of functions and restores the ability to
test if certain functions are available.
Summary
Add new
stdlib::has_functionfunction to test for function availability.Additional Context
The old
is_function_availablefunction was deprecated for quite some time and removed. It did not support testing for availability of modern functions, only 3.x style. This new function fully supports the various types of functions and restores the ability to test if certain functions are available.Checklist
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