Add some missing TCF-related fields to System model

[adamsachs]

Is your feature request related to a specific problem?

We need to add these fields to the System model:

• cookie_max_age_seconds: Optional[int]
• uses_cookies: bool, default=False
• cookie_refresh: bool, default=False
• uses_non_cookie_access: bool, default=False
• legitimate_interest_disclosure_url: Optional[AnyUrl]

Describe the solution you'd like

Update the System model, shouldn't be more complexity than that

Describe alternatives you've considered, if any

n/a

Additional context

broader ticket covering the updates across our stack: https://ethyca.atlassian.net/browse/PROD-1147

[Roger-Ethyca]

moving to done