Replace jsonwebtoken dependency

[jrhoads]

As stated in auth0/node-jsonwebtoken#863,

jsonwebtoken is a Node.js module, its use in a browser was never intended. Versions before 9.0.0 could use webpack's polyfill of the Node.js built-in modules. ....It is better to rely on JWT modules made to be consumed in browser environments. You can discover such modules on jwt.io under "JavaScript" libraries.

There are now issues with versions < 9.x

A potential replacement is something like jose

[jrhoads]

It is currently use here

akita/src/utils/session.ts

Line 2 in 1150d52

import JsonWebToken from 'jsonwebtoken'