Plugin system for flow-cli

[bluesign]

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Issue To Be Solved

Flow-cli is getting bigger and more powerful every day, maybe it is time to think about extensions ( plugins )

This issue is to kick off some discussion

(Optional): Suggest A Solution

I think npx [0] model can be very good here, as now we have some persistent place to put stuff. For example recent flowser edition can be something like:

flow plugin flowser/cli start ( which will somehow get related stuff from flowser/cli repo from github ) and download to user app settings as a package.

There are some security considerations for sure, but it can kick off some community contribution, without putting load on core devs.

[0] https://www.npmjs.com/package/npx