V2 fix 538 (#540)
* feat: add new env variable : REACT_APP_NO_ACTIVITY_TIMEOUT with default value 900 sec
* feat: logout user when no activity is detected after timeout
* build: bumb version to 2.4.16
* chore: remove useless env var and read tokenExpirationTime in token
* feat: avoid logout et decodeJwtToken when auth isn't enabled
* fix: acces token
* chore: create external hook
* chore: clear env file
* chore: refactor listenActivity to add listener
* chore: make sure that useAutoLogout is used inside authenticated component
* chore: move useAutoLogout
* build: bumb oidc-spa package
* chore: simplify logic
* fix: getTokens is not a function
* fix: expirationTime is already in ms
