An initial fstream implementation

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[codecov]

Codecov Report

❌ Patch coverage is 58.99705% with 139 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.34%. Comparing base (790da30) to head (a84ca85).

Files with missing lines	Patch %	Lines
fstream/fstream.go	55.02%	92 Missing and 2 partials ⚠️
fstream/lengthy.go	56.45%	24 Missing and 3 partials ⚠️
fstream/execution.go	74.19%	15 Missing and 1 partial ⚠️
fstream/construct.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
- Coverage   85.04%   81.34%   -3.71%     
==========================================
  Files          44       48       +4     
  Lines        2046     2385     +339     
==========================================
+ Hits         1740     1940     +200     
- Misses        267      400     +133     
- Partials       39       45       +6     

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