Implement placeholder opt-in metrics checkbox at the start of onboarding for new users and backend

[jrainville]

Description

status-go PR: https://github.com/status-im/status-go/pull/5477 (mostly ready now)

Once the status-go PR above is ready, we can start working on adding a placeholder checkbox on the onboarding for new users to opt in sending metrics.

This setting will be global for the installation/device. It needs to be before the sign in and login, because we want to track the onboarding metrics too.

Make it placeholder as we'll get the designs later.

Acceptance Criteria

• There is a switch or button on the first screen of onboarding that let's users opt-in to sending metrics
• If it is activated, the API on status-go is activated
• No need to have the deactivation for now until we have the designs
• No need to think about old users upgrading for now. Make it for new users only for now

[jrainville]

As per @cammellos :

(native-module/initialize-centralized-metrics {:appsflyerAppId config/appsflyer-app-id
                                                   :appsflyerToken config/appsflyer-token}
                                                  (fn [response]
                                                    (log/debug "metrics init response" response)
                                                    (toggle true #(log/debug "started metrics"))
                                                    (app-started-event))

So first you want to call the method:

.initializeCentralizedMetrics {"appsflyerAppId": "appid", "appsflyerToken": "token"} this should be at app initialization (we want to inject credentials at build time from the clients, discussed with Jakub) once you do that, you can start stop by running: .toggleCentralizedMetrics {"enabled": true} and you can push metrics using .addCentralizedMetrics {"eventName": "a string", "eventValue": any-valid-json}