Make connection speed test optional

[cereallarceny]

We need to add a field to the response of the authentication call for static FL. If the authentication endpoint returns with a worker_id, then we also need to return with another field: requires_speed_test which will either be true or false, depending on whether or not the server_config sets a minimum download speed OR a minimum upload speed. The requires_speed_test field is entirely dependent on those two server_config variables and cannot be set manually.

[github-actions]

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[cereallarceny]

Corrected workflow should be:

1. Worker sends an authentication request with the (optional) auth token, the model name (required), and the model version (optional).
2. PyGrid authenticates the worker and IF successful, returns a boolean value for the requires_speed_test property and a string value for the worker_id property.
3. If requires_speed_test was true, they perform that step. If not, see step 4.
4. Worker makes an FL cycle request, carry on…