fix ampl_meta re-exporting NLPModelMeta.get_* specializations

[apozharski]

Currently AmplNLReader re-exports over NLPModels get_* methods. This means you have to use the fully qualified names if you import both NLPModels and AmplNLReader which I think is unintended.

[apozharski]

@amontoison could you also take a look at this one :) not urgent but is also quite a small bugfix.

[amontoison]

If all tests passed, I will do a patch release :)

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.42%. Comparing base (de2f453) to head (4e7daa9).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ampl_utils.jl	25.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #166    +/-   ##
========================================
  Coverage   95.41%   95.42%            
========================================
  Files           3        6     +3     
  Lines         567      699   +132     
========================================
+ Hits          541      667   +126     
- Misses         26       32     +6     

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