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

[Planeshifter]

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

[stdlib-bot]

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

[kgryte]

@Planeshifter Is this issue now complete with everything added/merged?