[NI-velmurugan]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicable.
  - [ ] I've added tests applicable for this pull request

What does this Pull Request accomplish?

This PR adds niscope_external_clocking.py, a Python adaptation of the LabVIEW niScope EX External Clocking.vi

What testing has been done?

Manually tested the example using simulated hardware

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.05%. Comparing base (49c8447) to head (0eb8354).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2237      +/-   ##
==========================================
+ Coverage   86.40%   88.05%   +1.65%     
==========================================
  Files          86       86              
  Lines       21563    22535     +972     
==========================================
+ Hits        18631    19843    +1212     
+ Misses       2932     2692     -240     

Flag	Coverage Δ
codegenunittests	84.78% <ø> (ø)
nidcpowersystemtests	94.40% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.04% <ø> (ø)
nidigitalunittests	68.43% <ø> (ø)
nidmmsystemtests	92.33% <ø> (ø)
nifakeunittests	86.08% <ø> (ø)
nifgensystemtests	94.34% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsasystemtests	82.71% <ø> (?)
nirfsaunittests	63.37% <ø> (-0.03%)	⬇️
nirfsgsystemtests	81.22% <ø> (ø)
niscopesystemtests	89.99% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	81.66% <ø> (ø)
nitclksystemtests	?
nitclkunittests	98.26% <ø> (ø)

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