Track fit_mode and general model init params

[safaricd]

Change Description

With this change, we start tracking the fit_mode parameter that the estimators are initialized with.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the telemetry system by enabling the tracking of model initialization parameters, including fit_mode, during the model fitting process. This change provides a more comprehensive understanding of how models are configured and used by capturing these critical details and associating them with FitEvent telemetry events.

Highlights

• New Telemetry Functions: Introduced set_init_params and get_init_params functions to manage the storage and retrieval of model initialization parameters using Python's contextvars.
• FitEvent Enhancement: The FitEvent telemetry event now includes a new init_params field, which will capture the model's initialization parameters when a fit operation occurs.
• Parameter Tracking Integration: Modified the event sending mechanism to automatically attach the currently set init_params to FitEvent instances before they are dispatched.

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[gemini-code-assist]

Code Review

This pull request adds telemetry for model initialization parameters, specifically for fit_mode. The changes introduce set_init_params and get_init_params to store and retrieve these parameters using context variables, and a new init_params field is added to FitEvent. The implementation is consistent with existing code. My feedback focuses on improving the robustness of the new functions by handling more specific exceptions and adding logging, which will aid in debugging telemetry issues without affecting the main application.