Update core_interface.jl

[arnavk23]

This PR adds chsprod, chjprod, and cohprods routines to the CUTEst core_interface.jl as C-compatible function wrappers.
Adds interface bindings for:

• cutest_chsprod
• cutest_chjprod
• cutest_cohprods

Closes #347

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 73.95%. Comparing base (f2ad6a4) to head (6182154).
Report is 155 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core_interface.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #461       +/-   ##
===========================================
- Coverage   89.11%   73.95%   -15.16%     
===========================================
  Files           5        7        +2     
  Lines         790     1678      +888     
===========================================
+ Hits          704     1241      +537     
- Misses         86      437      +351     

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[amontoison]

@arnavk23
You forgot to the docstring in core.md:

┌ Error: 3 docstrings not included in the manual:
│ 
│     CUTEst.chjprod
│     CUTEst.cohprods
│     CUTEst.chsprod
│ 
│ These are docstrings in the checked modules (configured with the modules keyword)
│ that are not included in canonical @docs or @autodocs blocks.

[arnavk23]

@amontoison made the required changes. it should now be passing alll the checks.

[arnavk23]

@amontoison Passes all the checks, only failing the codecov check.

[amontoison]

The codecov failure is because you didn't added unit tests with the new interfzce routines.
However I can merge the current work, thanks you!