Improve the sdk connect/login flow

[r-marques]

The goal of this epic is to improve the nevermined connect/login flow by simplifying the configuration and artifacts needed to start using the sdk.

Improve Configuration

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1. Make neverminedNodeUri the only required configuration needed
2. The node info endpoint should return all the information needed for the sdk (node)
3. The node should be able to serve artifacts (node)
4. Do sanity to see if the options of the node and sdk are compatible

All the options will remain but will be optional and if set in the config it will override what the node returns. It does a sanity check to make sure its running with the correct options and exists early if it fails

Improve login

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1. The sdk should be able to properly initialize without a webProvider #624
   sdk +1
   
2. Simplify the way the node uses oauth tokens (it should only require one line the marketplace) (node and sdk)
3. Improve how the sdk handles the token
4. The Node should validate nft accesses independently of the JWT cache node#225
   node +1