(feature) Allow cli tool to use retriever other than fileretriever

[DeamonDev]

Requirements

Currently pkg/cli tool is capable only to use local file while performing evaluation of flag(s). This is hardcoded as follows

func (e evaluate) Evaluate() (map[string]model.RawVarResult, error) {
	c := ffclient.Config{
		PollingInterval:       10 * time.Minute,
		DisableNotifierOnInit: true,
		Context:               context.Background(),
		Retriever:             &fileretriever.Retriever{Path: e.config},
		FileFormat:            e.fileFormat,
	}

I propose to expand the capability of this tool to support at least httpretriever. Ideally I think we should support each retriever.

[thomaspoignant]

Hello @DeamonDev, this is a super good idea to make this possible.
The complex part will be how to configure that when calling the cli, but I guess you can look at what is done in the relay
proxy for this here.

In the case of the cli those params should probably be passed using the command line flags and not a file.

[DeamonDev]

Yeah, we may go as for now with passing all these arguments via flags.

[github-actions]

This issue has been automatically unassigned due to inactivity.