Handle And filter expired tasks

[sebastianvarela]

• Expose if a Task is expired or not according to his started and expiration strategy.
• Add Combine operator to filter expired task
• Add Combine operator to scope a suscription into a Task and bulk apply removeExpired && removeDuplicates
• Improve EraseToEmptyTask generics parameters

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (488b802) 93.82% compared to head (d88d3d4) 93.92%.

Files	Patch %	Lines
Sources/Publishers/Publishers.RemoveExpired.swift	88.00%	3 Missing ⚠️
Sources/Task/KeyedTask.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   93.82%   93.92%   +0.09%     
==========================================
  Files          38       40       +2     
  Lines        2074     2204     +130     
==========================================
+ Hits         1946     2070     +124     
- Misses        128      134       +6     

Flag	Coverage Δ
ios	93.78% <95.41%> (+0.10%)	⬆️
mac	93.92% <95.41%> (+0.09%)	⬆️
tv	93.92% <95.41%> (+0.23%)	⬆️

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