Model: Add ReportConfiguration

[fzdy1914]

Related #590, #467

Our user cannot edit the property of generated report.

Let's add a new model, ReportConfiguration, which serves the role to
configure the generated report.

[fzdy1914]

@eugenepeh @yamidark
As this is a totally new component, so I would like to ask for your opinion on the implementation of this pr.

For my implementation, I suppose that the report-config.json should under the same folder with the other two configs, which means, this feature only works with ConfigCliArgument.

There is also another possible implementation. We add one more arg e.g. --report-config to specify the location of the folder and put all the file related to the report config in it.

[eugenepeh]

For my implementation, I suppose that the report-config.json should under the same folder with the other two configs, which means, this feature only works with ConfigCliArgument.

I think we can go with that for now. --repo is usually meant for few repositories, so its not that important to add support for it yet.

[fzdy1914]

Put this PR on hold as there is no time to finish it.

[fzdy1914]

Anyone who is willing to take over the PR can just go ahead.

[fzdy1914]

Closing this PR because it has been inactive for a very long time. For the contributors who are willing to take over, you may just use the code here as a start point.