Add datadog-backend-listener v1.0.0

[nubtron]

Add the latest version of the Datadog backend listener plugin (1.0.0).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.02%. Comparing base (09d23ae) to head (7d97571).
⚠️ Report is 31 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #773      +/-   ##
============================================
+ Coverage     68.90%   69.02%   +0.12%     
- Complexity     2629     2652      +23     
============================================
  Files           230      233       +3     
  Lines         15965    16061      +96     
  Branches       1638     1650      +12     
============================================
+ Hits          11000    11086      +86     
+ Misses         4146     4144       -2     
- Partials        819      831      +12     

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[nubtron]

Thanks @undera for merging!