Add an `AmplNLPMeta`

[tmigot]

Following up #115

[codecov[bot]]

Codecov Report

Merging #116 (eebe6a1) into main (ff4262e) will decrease coverage by 0.98%. The diff coverage is 74.28%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   83.50%   82.51%   -0.99%     
==========================================
  Files           2        3       +1     
  Lines         291      326      +35     
==========================================
+ Hits          243      269      +26     
- Misses         48       57       +9     

Impacted Files	Coverage Δ
src/AmplNLReader.jl	100.00% <ø> (ø)
src/ampl_meta.jl	73.52% <73.52%> (ø)
src/ampl_model.jl	83.50% <100.00%> (+0.05%)	:arrow_up:

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[dpo]

Great, thank you!