Re-introduce decode property of jwt magic global
Re-introduce decode property of jwt magic global

Before #v3.0.0, the `jwt` magic global was a direct proxy for `jsonwebtoken@~0.4.1` which exposed a `.decode` method: https://github.com/auth0/node-jsonwebtoken/blob/342b86c49968bc1bfbdf985e83d83d0d3bd5e220/index.js#L3-L5.

When we bumped to `jsonwebtoken@~7.4.1`, this method was lost. This PR re-adds the missing method.

auth0/auth0-authz-rules-api