SDK-6019: Make Flutter ND plugin pure-Dart; surface attribution to client

[CTLalit]

Jira: SDK-6019 — epic SDK-5820

Supersedes the native portions of #77 / #78 / #81 — makes the plugin pure-Dart and surfaces attribution to the host via callbacks. Part of stack #80 (6 PRs).

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Attribution now flows through the host's clevertap_plugin Dart APIs, so the
ND plugin's native side is removed entirely and the plugin becomes pure Dart.
Supersedes the native portions of SDK-6009/6010/6013.

• Remove flutter/android/ and flutter/ios/ (native plugin + the SDK-6013
  podspec); drop the flutter.plugin.platforms block from pubspec — now a
  regular Flutter/Dart package. Keep flutter/LICENSE.
• NativeDisplayBridge slimmed to a pure-Dart helper: setLogLevel(NDLogLevel)
  and syncLogLevelFromCore(int) → NDLogger.syncFromCoreSdk (client-wins guard
  intact). All MethodChannel/EventChannel usage and fetchConfig/eventStream/
  pushEvent/pushViewed/pushClicked/getCoreDebugLevel removed.
• Attribution surfaced to the host via NativeDisplayView callbacks:
  onNotificationViewed(unitId) — fired once per impression via ViewedUnitsTracker;
  onNotificationClicked(unitId, elementId, extras) — extras built by
  ActionAttributionExtras. New NotificationClickScope (mirrors UnitIdScope) lets
  elements read the callback from context. Host feeds these into
  clevertap_plugin pushDisplayUnitViewedEvent / pushDisplayUnitElementClickedEvent.
• Re-lower the version floor: with compileSdk 36 gone, the binding constraint is
  webview_flutter 4.9.0 → Flutter 3.24 / Dart 3.5 (down from SDK-6013's 3.27).
• Tests: replace native arg-shape tests with pure-Dart log-level tests; add
  native_display_attribution_test.dart (viewed once/impression, click extras).
• gitignore the pub-generated flutter/.flutter-plugins* registrants.

flutter pub get resolves; flutter analyze clean; flutter test 213 pass.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

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