added support for 8-tuple through 11-tuple

[zubairehman]

• added support till 9-tuple

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[devoncarew]

Hi - thanks for the contribution here! With the recent release of Dart 3.0 and its support for Records, we plan to move this package into maintenance mode; not take any enhancements to it, and just maintain it from the POV of bug fixes / CI updates to keep it working. There's more detail in the related issue: #47.