feat(drain): add test-command subcommand

[KannarFr]

Summary

• Add getDrainTestCommand API client method for the GET .../drains/{drainId}/test-command endpoint
• Add clever drain test-command <drain-id> subcommand that returns a ready-to-execute shell command (curl/netcat) to manually test a drain recipient

Test plan

• clever drain test-command <drain-id> --app <app> returns a valid shell command for HTTP drains (curl)
• clever drain test-command <drain-id> --app <app> returns a valid shell command for syslog drains (netcat)
• clever drain test-command --help displays correct usage
• Other drain commands (create, get, disable, enable, remove) still work with --app

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[davlgd]

Revert --resource option on drain commands, use --app only for now

Is there a specific reason for this?

[KannarFr]

Revert --resource option on drain commands, use --app only for now

Is there a specific reason for this?

No, it was bad branch management, removing it from overview.

[hsablonniere]

@KannarFr Can you give more context?

From what I understood, we output a shell command that users can run to call their own app to mimick what we do when we send logs to drains.

1. Why don't we do the call on the backend side ourselves?
2. Won't we have differences between what we really do (headers, IPs...)?

I expected a similar UX as when I setup a hook on GitHub for example.

Naming nitpick: I expected test-command to test something (and do a call on the backend side), no to output (get) et command.

[KannarFr]

Yes I agree on your statements, will do.