Add POST /secret API for core-command

[FelixTing]

🚀 Feature Request

Relevant Package [REQUIRED]

This feature request is for core-command

Description [REQUIRED]

From Levski release, core-command service adds support for an external MQTT connection: https://docs.edgexfoundry.org/3.0/microservices/core/command/Ch-Command/#commands-via-messaging
In some cases, credentials and/or certificates are required to establish a connection.

Describe the solution you'd like

Implement a new API:
POST /secret

[cloudxxx8]

@lenny-intel may we implement this to resolve edgexfoundry/edgex-docs#1034?

[lenny-goodell]

@lenny-intel may we implement this to resolve edgexfoundry/edgex-docs#1034?

@cloudxxx8 , will have to go into 3.1
Note that all services have the ability to seed secrets vis Secrets File.
https://docs.edgexfoundry.org/3.0/security/SeedingServiceSecrets/#secrets-file
Please use this option in edgexfoundry/edgex-docs#1034.

[cloudxxx8]

this issue will be resolved once edgexfoundry/go-mod-bootstrap#478 is implemented

[lenny-goodell]

@cloudxxx8 , can this be closed since edgexfoundry/go-mod-bootstrap#478 is completed?

[cloudxxx8]

yes, we have applied it to edgex-go, and Cherry created the new tests for it
edgexfoundry/edgex-taf#862