fix: management methods throwing error on access

[pmalouin]

Changes

A few of the methods defined directly on the ManagementClient are throwing errors when accessed:

var ManagementClient = require('auth0').ManagementClient;
var management = new ManagementClient({
  token: '{YOUR_API_V2_TOKEN}',
  domain: '{YOUR_ACCOUNT}.auth0.com'
});
management.updateGuardianFactor

Throws:

TypeError: Cannot read property 'bind' of undefined
    at ManagementClient.get (./node-auth0/src/utils.js:59:37)

After debugging, I found that the error comes from the utils.wrapPropertyMethod() method that only supports a single level of nesting for propertyMethod (ex. a.b works, but not a.b.c).

In this PR, I review all methods defined on ManagementClient and ensure they all use one level of nesting instead of 2.

I also fixed the unit test that was supposed to catch this.

References

Please include relevant links supporting this change such as a:

• support ticket
• community post
• StackOverflow post
• support forum thread

Testing

Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

• This change adds unit test coverage
• This change adds integration test coverage

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[pmalouin]

This method does not exist, but deleteUser does.

[pmalouin]

method was always set to the last item in the methods array.

[lbalmaceda]

🎉