docs: Add Idempotency example

[hossambarakat]

Please provide the issue number

Issue number: #299

Summary

Introduce an example for Idempotency utility.

User experience

This pull request adds an example solution on how to use Idempotency utility

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

[hjgraca]

LGTM

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0a920b0) 69.11% compared to head (6a8d421) 69.11%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #300   +/-   ##
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  Coverage    69.11%   69.11%           
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  Files           79       79           
  Lines         3448     3448           
========================================
  Hits          2383     2383           
  Misses        1065     1065           

Flag	Coverage Δ
unittests	69.11% <ø> (ø)

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[amirkaws]

LGTM