feat: Incorporate a new initialization step for plugins

[gonzalobellino]

it would be really useful to allow plugins to invoke an initialization code, for example: "geth init"
as well as the extraction of configuration files on the computer, for example: geth leveldb database for a pre initialized custom network

This can have certain risks from a security point of view so one option could be to incorporate into the definition of the plugins a list of permissions to be authorized by the user