[EDU-1654] - Add generate Ably token authentication example

[GregHolmes]

This PR contains the two code samples for the new Examples section we are creating. It contains a Typescript and a React version for authentication requesting an access token from a backend server. This is a different structure example to most. This one requires a server to be running to generate the token so I've created an example for this in the server directory.

The README within each directory /examples/auth-generate-token/javascript and /examples/auth-generate-token/react contains information on how to get these running.

Jira epic ticket
Jira ticket.

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[m-hulbert]

This is going to be really useful, couple of suggestions:

I'd suggest that we have the steps already printed out, and then as they occur they receive a tick at the end of line. I think this might show the speed a bit more clearly, and also avoid the fact you can keep pushing 'connect'.

I know we spoke about it previously, but I think it would be worth expanding on all the steps and adding in everything that happens, even if some of it is server-side.

1. Client requests token from server
2. Client initializes connection to Ably with generated Token

Minor point: I think having a title like "Welcome to the Ably Token Manager" makes the process seem a bit more grandiose, when it's supposed to be (is) quite simple. Thoughts?

[ttypic]

Looks great, the only suggestion is to use ably/react for react example. Probably it will be a bit more code, but it will show that we recommend our react hooks for react apps

[m-hulbert]

Minor: should the directory be "auth-request-token" rather than generate?

Minor suggestions but LGTM 🙂