Add `avion2`

[tmigot]

https://github.com/mpf/Optimization-Test-Problems/blob/master/cute/avion2.mod

Another generated problem. This is one is large, but still readable.

[codecov[bot]]

Codecov Report

Base: 99.86% // Head: 99.86% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (1b01b56) compared to base (60b2107). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #206   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files         751      754    +3     
  Lines        6731     6818   +87     
=======================================
+ Hits         6722     6809   +87     
  Misses          9        9           

Impacted Files	Coverage Δ
src/ADNLPProblems/avion2.jl	100.00% <100.00%> (ø)
src/Meta/avion2.jl	100.00% <100.00%> (ø)
src/PureJuMP/avion2.jl	100.00% <100.00%> (ø)

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