feat: expand stream combinators

[blogle]

Summary

• add enumeration, counting, zipping helpers and cyclical streams
• support predicates, scanning, skip/take variations and take-until
• forward streams into sinks and provide test coverage

[codecov]

Codecov Report

❌ Patch coverage is 93.61702% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.16%. Comparing base (ccff54e) to head (60e7b0f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
kioto/streams/impl.py	93.61%	3 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   87.55%   88.16%   +0.60%     
==========================================
  Files          22       22              
  Lines        1278     1419     +141     
  Branches      160      179      +19     
==========================================
+ Hits         1119     1251     +132     
- Misses        107      110       +3     
- Partials       52       58       +6     

Files with missing lines	Coverage Δ
kioto/streams/impl.py	95.44% <93.61%> (-0.87%)	⬇️

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