Add `purge` commands to CLI tool #599

Job	Run time
Configure AWS Credentials / OIDC Auth	14s
qa / Prepare for Go QA	27s
qa / Lint terraform	21s
Build Lambda handlers / prepare	42s
qa / Vet Go Code	1m 36s
qa / Run Go Tests	2m 38s
qa / Lint Go Code	1m 50s
qa / Ensure Go Builds	1m 25s
Build Lambda handlers / Build CLI	0s
Build Lambda handlers / Build Lambdas	2m 33s
Plan Terraform / Validate and plan terraform	1m 46s
Publish Terraform Plan / Publish Terraform Plan	16s
	13m 48s

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