SMS-6439: Adding registration_status filter option for Python SDK

[rajneeshkatkam-plivo]

Jira Link: https://plivo-team.atlassian.net/browse/SMS-6439

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.72%. Comparing base (045f6bc) to head (05856fe).
Report is 74 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #251   +/-   ##
=======================================
  Coverage   82.72%   82.72%           
=======================================
  Files          77       77           
  Lines        4990     4990           
=======================================
  Hits         4128     4128           
  Misses        862      862           

Flag	Coverage Δ
unittests	82.72% <100.00%> (ø)

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[prashantjha-plivo]

LGTM, do check the pending build steps