Record Session start time

[nmcharlton]

Is your feature request related to a problem? Please describe.
We need to uniquely identify sessions in the Admin Panel in a way that's meaningful for users.
Wallet name + session start date and time seems like a good way of doing so.

At the moment we can either derive the captured_at date/time for the earliest capture in the session (cumbersome), or use the created_at session time (potentially confusing for users).

Describe the solution you'd like
Record and upload the start time of each tracking session as part of the session information.

Describe alternatives you've considered
We could just derive a pseudo-start time using the first captured_at time in the bulk pack pipeline, but I'm not clear on whether the start of the session and first capture are considered as separate events in the app.

Additional context
Greenstand/treetracker-admin-client#896 describes the need to filter captures by session.
Eventually, we will add a Tracking Sessions page in the Admin Panel that will display a summary of the session and act as a starting point for verification and analysis.

[Kpoke]

A start_time field for sessions has been integrated into the dev environment's ingestion pipeline.

[Elforama]

Notes for Android work:

• Session start time is already captured and saved
• Session start time is not part of the SessionRequest object
• Add session time to the request as 'start_time'