Add a sigauth.config.ts for SigAuth CLI

[Sigabiel]

To build the custom types and communicate with the SigAuth Core the sdk needs the following fields
ISSUER_URL, APP_ID, APP_TOKEN

This is information wether be stored inside the projects ´.env´ file or in a seperate config. To invoke separation of concerns I would suggest using a custom config.
This config can be easily custom typed and extended later on to improve usability

Current fields that could belong in such a config

{
  "issuer": "https://<your-sigauth-instance-domain>",
  "appId": "<uuid>",
  "appToken": "<token",
}

Field	Type	Description
issuer	string	URL of your SigAuth instance; identifies the authentication server.
appId	string	UUID of the App registered in your SigAuth instance
appToken	string	random Char Token to authenticate & authorise sdk requests

While implementing the SDK I need to reimplement the AuthGuards because all interaction with the core happens through the sdk. That means every request needs to be validated by the appId and appToken.

• Permissions of the Apps using the SDK are validated using the AppScopes
• Session and request validation is made on the app using the sdk utilitis. That means
  • Checking if the accessToken is valid (automatic refresh if needed)
  • Each Core Action (Managing an Assets, AssetTypes & Grants) will be still authorized by the core to avoid poorly implemented apps from authorization mission critical actions
  • Incertain cases you might want apps to manage assets by itself this would not be possible if an account accessToken is required for authorization. Therefore I'll add a flag internalAccountAuthorization which toggles the core check of required user permissions to all actions of that request.
  • That means that each SDK Request needs a option object which allows to toggle the internal account authorization