[Term Entry] Dart list method: .indexWhere()

[cysiupe]

Description

• Added the List.indexWhere() term for Dart
• Closes #4308

Type of Change

• Adding a new entry

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [ ] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[Sriparno08]

Hey @cysiupe, please sign the CLA by clicking on the 'Contributor License Agreement' link provided in the message from @CLAassistant above as it is a must for first-time contributors.

[cysiupe]

Hey @cysiupe, thanks for contributing to Codecademy!

I've listed all the modifications that you need to make in your entry below:

Hi @Sriparno08 . Thank you so much for your help. I applied all requested modifications and I hope this time everything will be fine.

[cysiupe]

Hey @cysiupe, please sign the CLA by clicking on the 'Contributor License Agreement' link provided in the message from @CLAassistant above as it is a must for first-time contributors.

Hi @Sriparno08. I signed CLA. Thank you for your advice.

[cysiupe]

Looks good for a second review 👍

Thank you so much for your help and review @Sriparno08 .

[github-actions[bot]]

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