CLI: conduit processors ls

[raulb]

This command will list all the available processors.

It requires having Conduit previously running.

Flags

Name	Description	Required	Default Value
grpc.address	address for serving the gRPC API	No	":8084"

--help

$ conduit processors ls
NAME          TYPE      PIPELINE
avro.decode   builtin   my-pipeline
avro.encode    builtin   my-pipeline
base64.decode  builtin   my-other-pipeline

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Part of #1911