feat: Add analytics, logging & accessibility

[bthebladeprimer]

Summary

• Adds CheckoutComponents analytics infrastructure: event models, session config, environment provider, event buffer, event service, network client, and payload builder
• Adds analytics domain layer with DefaultAnalyticsInteractor and AnalyticsInteractorProtocol
• Adds Datadog-compatible logging system: log models, session context, environment provider, payload builder, sensitive data masker, and network client
• Adds accessibility framework: configurable identifiers, VoiceOver announcement service, SwiftUI accessibility extensions
• Includes 12 test files covering analytics models/services, logging services/masker, and accessibility announcements

Context

PR 8 of 15 in the CheckoutComponents feature split. Provides cross-cutting concerns (observability, accessibility) used by all UI components. Depends on PR 7 (#1636).

Tracker: https://www.notion.so/32fca65dc30e81dabf66f33e2b58c3a1

Test plan

• Verify analytics tests pass (AnalyticsEnvironmentProviderTests, AnalyticsEventBufferTests, AnalyticsEventServiceTests, AnalyticsModelsTests, AnalyticsPayloadBuilderTests)
• Verify logging tests pass (LoggingServiceTests, LogEnvironmentProviderTests, LogPayloadBuilderTests, LoggingSessionContextTests, SensitiveDataMaskerTests, DatadogErrorClassifierTests)
• Verify AccessibilityAnnouncementServiceTests passes
• Confirm sensitive data masker correctly redacts PII (card numbers, emails, etc.)
• Run: xcodebuild -workspace PrimerSDK.xcworkspace -scheme PrimerSDKTests -destination "platform=iOS Simulator,name=iPhone 16" test

[github-actions]

	Warnings
⚠️	> Pull Request size seems relatively large. If this Pull Request contains multiple changes, please split each into separate PR will helps faster, easier review.

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