Added pflag support in cli

[yindia]

TL;DR

Added pflag support for a dependent pr https://github.com/flyteorg/flyteplugins/pull/191/files

• bump new version of flytestdlib for flag support

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

Remove the 'fixes' keyword if there will be multiple PRs to fix the linked issue

fixes flyteorg/flyte#1253

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #11 (d8ba933) into master (da8ebe1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #11   +/-   ##
=======================================
  Coverage   17.79%   17.79%           
=======================================
  Files           3        3           
  Lines         399      399           
=======================================
  Hits           71       71           
  Misses        315      315           
  Partials       13       13           

Flag	Coverage Δ
unittests	16.80% <ø> (ø)

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