fix: use RDATE in time range check and use all instances

[SebastianKrupinski]

Summary

• added RDATE property to isInTimeRange calculation
• added RDATE property instance handling in EventIterator
• added tests for RDATES with multiple dates and multiple instances

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (778bb46) to head (099a377).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #735      +/-   ##
============================================
+ Coverage     98.76%   98.78%   +0.02%     
- Complexity     1875     1877       +2     
============================================
  Files            71       71              
  Lines          5345     5275      -70     
============================================
- Hits           5279     5211      -68     
+ Misses           66       64       -2     

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