fix: context propagation issue

[muktihari]

The main goals of having context is to cancel the process as soon as we can when the context is canceled or the deadline is exceeded to save resources. This PR should be sufficient to do the logic without altering existing code that much, since it's only one layer above it. Things to note, on Encode for example, when the context is canceled, some bytes written to the io.Writer might be truncated, but it will end with a proper message since we try to stop the process per a single message encoding. It's up to the user to clean up the underlying writer as necessary. If user does not want the file to be truncated, they need to use Encode() instead.

close #72

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1ea859a) 100.00% compared to head (32a1aec) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #73   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           27        27           
  Lines         2989      3062   +73     
=========================================
+ Hits          2989      3062   +73     

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