Implement feature flags related functions in
Posthog analytics backend.
We cache the results in django cache to avoid
too frequent calls to Posthog.
Especially for when we are checking multiple features in
the same user request.
Extend the AnalyticsBackend class to support
user feature flags, without a breaking change to the
current implementation.
A flag value is considered to be a bool or a string.
Switch the analytics backend interface from a typing Protocol to an
abstract base class, so the contract that backends must implement
is explicit and enforced at instantiation time.
Add an analytics abstraction that allows configuring which analytics
solution the app uses. PostHog is implemented as one backend, but by
default no analytics backend is activated.
The goal is to track events in a sufficiently organized way and to
let any developer implement their own backend as long as it follows
the same protocol.
Florent Chehab