Improve token permissions parsing

[gillchristian]

There are a few things to improve in the token permission(s) parsing now.

• We default to JobWrite but docs state we don't (I think this is good expected behavior)
• We ignore failure to parse any permissions
• We use "serde_json" meaning we need to do some formatting of the data in order to parse it as valid JSON
• As we add more permissions in the token it will probably make sense to add a better documentation for them in the CLI