Rename: Remove suffix R1 from classes

[carlos-adir]

Rename usual classes to remove the suffix R1:

• EmptyR1 to Empty
• WholeR1 to Whole
• SingleValueR1 to SingleValue
• IntervalR1 to Interval
• DisjointR1 to Disjoint

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.84%. Comparing base (49af49f) to head (adcc428).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files           9        9           
  Lines         649      649           
=======================================
  Hits          648      648           
  Misses          1        1           

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