Add an API endpoint to serve the list of modules, their documentation and default parameter values (defaultConfig.json)

[royjohal]

Description
Currently, there is no way for the client (GUI, etc) to know which parameters are to be supplied for each module, what the default values are, what their max/min values are, etc.
In the deployed environment, the client needs to be aware of this information which inherently belongs to the server.
An API endpoint /modules with an object providing all this information would even render future server-side modifications replicable on the client automatically.