Remove usage of and deprecate upa::string_view

[rmisev]

The std::string_view must be used instead. The upa::string_view is just an alias for std::string_view.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.64%. Comparing base (19e495d) to head (d5d7971).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #202   +/-   ##
=======================================
  Coverage   99.64%   99.64%           
=======================================
  Files          21       21           
  Lines        3698     3698           
  Branches      623      623           
=======================================
  Hits         3685     3685           
  Misses         13       13           

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