RUMM-833 Add public API for Data Tracking Consent

[ncreated]

What and why?

📦 This PR adds the public API for configuring tracking consent:

Datadog.initialize(
   appContext: ...,
   trackingConsent: .pending,
   configuration: ....
)

Datadog.set(trackingConsent: .granted)

How?

New public APIs were introduced both for Datadog and DatadogObjc.

The previous variant of Datadog.initialize() is marked deprecated.

I also added tests for Logger, Tracer and RUMMonitor to assert they respect the consent value when collecting data.

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference