Add JTI_CLAIM to SIMPLE_JWT config

[lorddaedra]

Add ability to change jti key name for integration with Auth0 (Auth0 do not add jti to jwt by default and you can't add jti via hooks there).

So access_token['jti'] = require('uuid').v4(); will not work, but access_token['https://domain.com/jti'] = require('uuid').v4(); will add https://domain.com/jti

It can look like:

SIMPLE_JWT = {
    ...
    'JTI_CLAIM': 'https://domain.com/jti',
}

default value: 'jti'

Related question on Auth0 support forum: https://community.auth0.com/t/set-token-exp-jti-in-client-credentials-exchange-hook/6732

[davesque]

Just released version 4.3 which includes this feature.