[RUM-7181] SR: Fine Grained Masking privacy configuration

[marco-saia-datadog]

What does this PR do?

Introduces Fine Grained Masking configuration properties for Session Replay with imagePrivacyLevel, touchPrivacyLevel, textAndInputPrivacyLevel.

The legacy defaultPrivacyLevel has been deprecated. Setting this property will override the FGM configuration.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• [ ] If this PR is auto-generated, please make sure also to manually update the code related to the change