[CHORE] [NO JIRA] Cleanup of unused imports and param docs

[sbarrio]

What does this PR do?

It cleans up unused imports and also fixes missing or wrong parameter documentation on part of the SDK's API.

Motivation

We should not have unused imports or wrongly documented functions.

Additional Notes

Thanks to @abrooksv for raising 🙌

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

[Copilot]

Pull request overview

Cleanup-focused PR that removes unused imports across iOS/Android modules and aligns public-facing API documentation (KDoc/SwiftDoc/README) with the current SDK configuration surface.

Changes:

• Removed unused imports in WebView and Core Android/iOS native modules.
• Updated README config example to use the correct resourceTraceSampleRate field and simplified the logEventMapper example.
• Corrected/updated parameter documentation for native APIs (e.g., added fingerprint param doc; removed stale param docs).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/react-native-webview/ios/Sources/RCTDatadogWebViewManager.mm	Removes an unused umbrella import in the iOS WebView manager.
packages/react-native-webview/android/src/newarch/com/datadog/reactnative/webview/DdSdkReactNativeWebViewPackage.kt	Removes unused WebView module imports in new architecture package.
packages/core/README.md	Updates configuration example field name and refines mapper example (but currently introduces a syntax issue).
packages/core/ios/Sources/DdSdkConfiguration.swift	Removes stale parameter documentation for Trace configuration.
packages/core/ios/Sources/DdLogsImplementation.swift	Updates parameter doc name for logger configuration initializer.
packages/core/android/src/main/kotlin/com/datadog/reactnative/DdSdkReactNativePackage.kt	Removes an unused Android import.
packages/core/android/src/main/kotlin/com/datadog/reactnative/DdSdkConfiguration.kt	Removes an unused Android import.
packages/core/android/src/main/kotlin/com/datadog/reactnative/DdRumImplementation.kt	Adds missing KDoc for the fingerprint parameter on addError.

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