Implement tracking API

[asaphko]

Having implemented the functionality in the API, add an OpenFeature tracking API implementation to the provider.

Context:
https://github.com/open-feature/python-sdk?tab=readme-ov-file#tracking

Flagsmith/flagsmith#6641
export interface IPipelineEvent { event_id: string; // flag_name or event_name event_type: PipelineEventType; evaluated_at: number; identity_identifier: string | null; enabled?: boolean | null; value: IFlagsmithValue; traits?: { [key: string]: null | TraitEvaluationContext } | null; metadata?: Record<string, any> | null; }