Change names to Metis api

[filikat]

Change names to Metis API within HiGHS, to avoid conflicting with external Metis when HiGHS is linked in some other project.

Closes #2823.

[filikat]

@amontoison Is this ok? Let me know if anything else needs to be changed.
If the name conflict is a big problem, we can make a patch, but the next release should come shortly anyway.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (5e3106b) to head (61c1358).
⚠️ Report is 6 commits behind head on latest.

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #2825   +/-   ##
=======================================
  Coverage   80.24%   80.25%           
=======================================
  Files         348      348           
  Lines       86186    86189    +3     
=======================================
+ Hits        69164    69169    +5     
+ Misses      17022    17020    -2     

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[jajhall]

All fine by me