feat: add SMS verification code flow #328

Job	Run time
Discover functions	5s
Build knative-job-service	1m 30s
Build python-example-fn	29s
Build knative-job-example-fn	1m 12s
Build send-verification-link-fn	1m 21s
Build send-email-fn	1m 13s
Build sql-example-fn	1m 34s
Build send-sms-fn	1m 40s
	9m 4s

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