Isar NoSQL Database for Flutter

[brunogabriel]

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Description and links to repo and pubdev if any

Add Isar NoSQL Database for Flutter. Repo link: https://github.com/isar/isar/ Documentation: https://isar.dev/ Stars: 3487

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Checklist

• [x] I read How to contribute
• [x] I edited the SOURCE.md file only
• [x] Added a link to the repo in the PR

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