RUM-8855 Increase Batch Processing Levels

[maxep]

What and why?

Increase batch processing levels.

More context in RFC (internal)

How?

/// Defines the maximum amount of batches processed sequentially without a delay within one reading/uploading cycle.
public enum BatchProcessingLevel {
    case low
    case medium
    case high

    var maxBatchesPerUpload: Int {
        switch self {
        case .low:
            return 5
        case .medium:
            return 20
        case .high:
            return 100
        }
    }
}

I took the opportunity to add the maxBatchesPerUpload to the UploadPerformancePreset protocol, which could be used for overrides.

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
• Add Objective-C interface for public APIs (see our guidelines [internal]) and run make api-surface)

[datadog-datadog-prod-us1]

Datadog Report

Branch report: maxep/RUM-8855/increase-batch-processing-level
Commit report: e82973c
Test service: dd-sdk-ios

✅ 0 Failed, 1088 Passed, 2728 Skipped, 1m 3.28s Total duration (1m 33.68s time saved)

[ncreated]

🎯

[ncreated]

👏 👍 It should have belong here since introduced.