Add getFormatter() and getData() methods to DataStream

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.84%. Comparing base (3a4caff) to head (000b857).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #110   +/-   ##
=========================================
  Coverage     99.84%   99.84%           
- Complexity      249      251    +2     
=========================================
  Files            33       33           
  Lines           633      637    +4     
=========================================
+ Hits            632      636    +4     
  Misses            1        1           

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