forest-cli requires FULLNODE_API_INFO to be explictly set while lotus does not when invoked on the same host of the daemon

[hanabi1224]

Issue summary

Lotus daemon saves API token at ~/.lotus/token by default. When lotus client is invoked on the same host, FULLNODE_API_INFO does not need to be explicitly set to invoke RPC methods that require permissions beyond READ.

We should consider matching lotus behaviour to improve ease-of-use

e.g.

lotus auth create-token --perm admin
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJBbGxvdyI6WyJyZWFkIiwid3JpdGUiLCJzaWduIiwiYWRtaW4iXX0.JP_jCnYLecStCn9Eawf0kPLrFlRWv-he7NGLcH44Ouc

while with forest

forest-cli auth create-token --perm admin
Error: ErrorObject { code: ServerError(401), message: "Unauthorized", data: None }

Caused by:
    ErrorObject { code: ServerError(401), message: "Unauthorized", data: None }

Other information and links

[LesnyRumcajs]

I'm okay with that change. We already have the code for this under --save-token. That said, some documentation would need to be updated both here and in the docs repository.