FFM-12088 Retry on HTTP status code 0

[erdirowlands]

What

• Http code 0 is returned by the typheous client for any uncategorised http errors. We should be able to assume most of the uncategorised attempts to connect to SaaS / Proxy are transient, and allow the SDK to retry. This PR adds 0 to the list of retryable codes.

• -1 was being returned due to a bug in the OpenAPi generator, which meant the retryable codes were not being properly evaluated. This returns the code if it exists, or -1 if not

• Adds an optional timeout_ms parameter to wait_for_initialized

Testing

Used local proxy tool to

• return 0 for auth attempts. SDK retries
• return 404 for auth attempts, SDk does not retry
• supply timeout_ms argument and delay auth, the wait_for_initialization call unblocks and the SDK serves defaults

[akiraqb]

some pretty cutting edge stuff!