Keep track of temporary files

[tmigot]

Allow doing the following

for file in NLPModelsIpopt.TEMP_FILES @show isfile(file) end

#101 / #100 : Closing the file by end doesn't after creating the stats doesn't seem to work as I get a resource busy or locked (EBUSY) error.

[codecov]

Codecov Report

Base: 93.96% // Head: 94.01% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (23b9848) compared to base (1a16af5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   93.96%   94.01%   +0.05%     
==========================================
  Files           1        1              
  Lines         116      117       +1     
==========================================
+ Hits          109      110       +1     
  Misses          7        7              

Impacted Files	Coverage Δ
src/NLPModelsIpopt.jl	94.01% <100.00%> (+0.05%)	⬆️

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