Add withAbortSignal()

[theogravity]

Addresses #92

[mooreds]

Any reason not to use signal: AbortSignal.timeout( 60000 ) instead, since the options doc says Signal is recommended instead.

[robotdan]

If we want to use a timeout, the timeout value should be set on the class and referenced just like we do for credentials.

So I would suggest we :

• add a new field for timeout, we can default to 60 seconds if we want.
• add new with* method so this can be set using the builder pattern.

Agree with @mooreds - sounds like the API doc suggest using Signal instead.

Then, to complete this work, we'll need to expose this in the FusionAuth REST client. Perhaps we can add this to the builder once this PR is complete.

• https://github.com/FusionAuth/fusionauth-typescript-client/blob/master/src/FusionAuthClient.ts
• https://github.com/FusionAuth/fusionauth-client-builder/blob/master/src/main/client/typescript.client.ftl

[theogravity]

I've updated the PR to add a withAbortSignal() instead.

I'm not sure how this gets incorporated into the two files mentioned above, though.

[theogravity]

required to add the AbortSignal type