[RFC]: Add C implementations to Kumaraswamy distribution functions (tracking issue)

[Planeshifter]

This RFC proposes adding C implementations to all Kumaraswamy distribution functions in @stdlib/stats/base/dists/kumaraswamy .

[stdlib-bot]

🚨 Important: PLEASE READ 🚨

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✨ Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions. ✨