Update stream ext encoder interface

[shamaton]

This update becomes easier to use stream ext encoder.

[codecov]

Codecov Report

Attention: Patch coverage is 77.27273% with 10 lines in your changes missing coverage. Please review.

Project coverage is 98.55%. Comparing base (9d4237b) to head (6775107).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
time/encode_stream.go	16.66%	0 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   98.09%   98.55%   +0.46%     
==========================================
  Files          72       71       -1     
  Lines        5554     5532      -22     
==========================================
+ Hits         5448     5452       +4     
+ Misses         82       56      -26     
  Partials       24       24              

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