TUVX core julia interface

[K20shores]

With the main components in place, we can start running tuvx and returning values

Acceptance criteria

• create from file/string, Run, the count getters, the three orderings.
• Tests build from a known-good config (reuse existing TUV-x test configs/data)
  and check output shapes / orderings. Run actually executes here, so the
  "good inputs only" rule matters most in this PR.
• if possible and it makes sense, format the data into a netcdf dataset

Ideas

• evaluate python and fortran interface implementations and see what fits best