)

This commit updates the Sequential Planner example to include a new
feature that demonstrates how to save and recall a plan for future use.
It also refactors some code to improve readability and maintainability,
such as extracting methods for initializing the kernel with memory and
retrieving the memory store.

Resolves microsoft#2343 

### Example Output
```
======== Sequential Planner - Create and Execute Email Plan ========
Original plan:
 Goal: Summarize an input, translate to french, and e-mail to John Doe

 Steps:
  - SummarizeSkill.Summarize INPUT='$INPUT' => SUMMARIZED_TEXT
  - WriterSkill.Translate input='$SUMMARIZED_TEXT' language='French' => FRENCH_SUMMARY
  - email.GetEmailAddress INPUT='John Doe' => JOHN_DOE_EMAIL
  - email.SendEmail email_address='$JOHN_DOE_EMAIL' INPUT='$FRENCH_SUMMARY'
Step 1 - Results so far:
In a distant kingdom, King Arjun ruled fairly, but a dragon terrorized his people. Archer Mira offered help, killed the dragon with one shot, and married Arjun. They ruled together, living happily ever after, with Mira remembered as their savior.
Step 2 - Results so far:
Dans un royaume lointain, le roi Arjun régnait de manière juste, mais un dragon terrorisait son peuple. L'archère Mira proposa son aide, tua le dragon d'un seul coup et épousa Arjun. Ils régnèrent ensemble, vivant heureux pour toujours, et Mira fut commémorée en tant que leur sauveuse.
Step 3 - Results so far:
johndoe1234@example.com
Step 4 - COMPLETE!
Sent email to: johndoe1234@example.com. Body: Dans un royaume lointain, le roi Arjun régnait de manière juste, mais un dragon terrorisait son peuple. L'archère Mira proposa son aide, tua le dragon d'un seul coup et épousa Arjun. Ils régnèrent ensemble, vivant heureux pour toujours, et Mira fut commémorée en tant que leur sauveuse.

======== Sequential Planner - Find and Execute Saved Plan ========
Goal: Write summary in french and e-mail John Doe
Searching for saved plan...
Restored plan (relevance=0.9370563865513345):
 Goal: Summarize an input, translate to french, and e-mail to John Doe

 Steps:
  - SummarizeSkill.Summarize INPUT='$INPUT' => SUMMARIZED_TEXT
  - WriterSkill.Translate INPUT='$SUMMARIZED_TEXT' language='French' => FRENCH_SUMMARY
  - email.GetEmailAddress INPUT='John Doe' => JOHN_DOE_EMAIL
  - email.SendEmail email_address='$JOHN_DOE_EMAIL' INPUT='$FRENCH_SUMMARY'

Result:
Sent email to: johndoe1234@example.com. Body: Dans un futur lointain, Remy, 15 ans, découvre un secret dangereux, ce qui le force à fuir avec l'aide d'Eve. Poursuivis par la Fédération Galactique, ils découvrent son passé, révélant qu'il n'est pas un garçon ordinaire.
```

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

---------

Co-authored-by: Shawn Callegari <36091529+shawncal@users.noreply.github.com>