[FEATURE] Preload/Restore Chatflows, Agents and Tools from github/zip

[LuisFX]

Preload/Restore Chatflows, Agents and Tools from github/zip

Linking Flowise to a DB is very useful indeed. Yet, when setting up new or reconstituting an environment from scratch for development or to simply use as a sandbox, it would be useful if all flows and tools could be loaded from an alternative source.

In addition to postgres, when making changes to flows/tools, we usually save each revision to github (to mantain feature parity with our release cycle).

Sometimes we want to keep alternative instances of flowise for a multitude of reasons. Being able to reconstitute a fully functioning 'standalone' flowise instance is extremely useful (when we're developing on the move, etc).

It would be a nice feature if we can rebuild said instance from either a zip file or even from a github repo. Maybe with a convention folder structure, eg:

flowise/
   chatflows/*.json
   agents/*.json
   tools/*.json