bug: ext-plugin-pre-req conf value doesn't allow anything else then string

[mkyc]

Current Behavior

Currently only possible type passed to ext-plugin-pre-req value is string. So to pass anything else then just single value we need to encode it.

      plugins:
        - config:
            conf:
              - name: my-plugin
                value: "{\"test\":\"ugly\"}"
          enable: true
          name: ext-plugin-pre-req

Expected Behavior

It'd be much nicer to make it possible to pass anything there i.e.:

      plugins:
        - config:
            conf:
              - name: my-plugin
                value: 
                  test: "nice"
          enable: true
          name: ext-plugin-pre-req

Error Logs

No response

Steps to Reproduce

NA

Environment

NA

[mkyc]

I think it's somewhere here to be changed, but I'm not familiar with Lua well enough to propose PR.