Add RecurrenceSet::isFinite method to deprecate isInfinite, closes #134

[dmfs]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.63%. Comparing base (05920e7) to head (fd1177f).

Files	Patch %	Lines
src/main/java/org/dmfs/rfc5545/RecurrenceSet.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #135      +/-   ##
============================================
+ Coverage     77.59%   77.63%   +0.03%     
- Complexity      556      563       +7     
============================================
  Files            72       73       +1     
  Lines          2089     2097       +8     
  Branches        372      373       +1     
============================================
+ Hits           1621     1628       +7     
- Misses          323      324       +1     
  Partials        145      145              

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