RUM-5174 Fix attributes objc interop

[0xnm]

What and why?

All the attributes coming from ObjC API are wrapped into AnyEncodable

dd-sdk-ios/DatadogObjc/Sources/ObjcIntercompatibility/ObjcIntercompatibility.swift

Line 13 in 1a61f0f

return attributes.mapValues { AnyEncodable($0) }

. It means that we cannot get raw attribute value when getting it by key, we need to unwrap it.

How?

Wrap objc attribute in AnyEncodable only if the type is not already Encodable.

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

Custom CI job configuration (optional)

• Run unit tests for Session Replay