RUM-5390 Add Image Privacy Level Configuration

[maciejburda]

What and why?

Adds image recording configuration based on this RFC (internal), allowing to record all, contextual or no images.

How?

It's propagated in similar way to Privacy, through context. Additionally we needed a way to enforce image recording, currently used by UIActivityRecorder.

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
• [ ] Add CHANGELOG entry for user facing changes

[datadog-datadog-prod-us1[bot]]

Library Vulnerabilities

[mariedm]

Is that the sort of things we want to add to the changelog?

[maciejburda]

Changing to draft. There's a performance issue on Shopist which will require additional investigation.

[maciejburda]

We decided to merge it to a feature branch.