feat(examples): add moul/xmath (#3403) #7975

Job	Run time
setup	4s
Run Main (github-bot) / Go Build / generated	9s
Run Main (github-bot) / Go Lint / lint	31s
Run Main (github-bot) / Go Test / test	35s
Run Main (gnodev) / Go Build / generated	12s
Run Main (gnodev) / Go Lint / lint	54s
Run Main (gnodev) / Go Test / test	1m 22s
Run Main (gnofaucet) / Go Build / generated	8s
Run Main (gnofaucet) / Go Lint / lint	41s
Run Main (gnofaucet) / Go Test / test	44s
Run Main (gnogenesis) / Go Build / generated	9s
Run Main (gnogenesis) / Go Lint / lint	43s
Run Main (gnogenesis) / Go Test / test	47s
Run Main (gnohealth) / Go Build / generated	12s
Run Main (gnohealth) / Go Lint / lint	31s
Run Main (gnohealth) / Go Test / test	40s
Run Main (gnokeykc) / Go Build / generated	11s
Run Main (gnokeykc) / Go Lint / lint	44s
Run Main (gnokeykc) / Go Test / test	45s
Run Main (gnomd) / Go Build / generated	13s
Run Main (gnomd) / Go Test / test	35s
Run Main (gnomd) / Go Lint / lint	23s
Run Main (gnomigrate) / Go Build / generated	9s
Run Main (gnomigrate) / Go Test / test	42s
Run Main (gnomigrate) / Go Lint / lint	39s
	12m 43s

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