* refactors revocation of oauth2 tokens by adding revocation of access_tokens which will result in automatic removal on sso portal side
* drops unused return statement on same method
* adds assertions for correct revocation responses
* integrates authlib into project
* adds authlib package to requirements.txt
* refactors internal konova/utils/generators/generate_token method to use authlib's generate_token method and act as wrapper for backwards compatibility
* refactors OAuth views to be based on authlib's oauth client implementation
* refactors oauth model to work with authlib's oauth2 tokens
* fixes documentation and variable names on oauth token revocation
* introduces private key for propagation
* changes key usage in decryption of propagated user data from oauth_client_id to private propagation key
* adds token checking to AbstractModelAPIView
* adds user accessibility filtering for intervention API v1
* extends fetch_and_serialize() method to take a dict for db filtering instead of a single field and value
* organizes urlnames into supporting formats like "api:v1:intervention"
* adds new app to project
* adds relation between User model and new APIUserToken model
* adds first implementation for GET of intervention
* adds basic code layout for future extension by having new versions
mpeltriaux