feat(vad_handler): Add onLog callback for crash-report breadcrumbs

- Add optional `VadLogCallback? onLog` to `VadHandler.create` for routing
production logs to consumer-side telemetry (Crashlytics/Sentry/Bugsnag)
without zone or `debugPrint` overrides
- Add `VadLogCallback` typedef exported from `package:vad/vad.dart`
- Emit always-on `VadModel: creating OrtSession (model=... bytes=...
sampleRate=... os=... osVersion=...)` breadcrumb immediately before each
ONNX Runtime session creation on native platforms — lands in logcat as
the last line before any native crash inside libonnxruntime.so
- Route all non-debug failures through `onLog` when set: native + web
session-creation errors, `VadIterator` frame/inference errors, and
`VadHandler` audio-stream / microphone-permission failures. Verbose
`if (isDebug) print(...)` debug logs intentionally stay on `print`
- Thread `onLog` through `VadIterator.create` → `VadInference.create` →
native/web inference factories → Silero v4/v5 models
- README: Document `onLog` on `VadHandler.create` and add a Reporting
Issues troubleshooting section with `adb logcat` capture instructions
and a Crashlytics wiring example
- Bump version to 0.0.8

Signed-off-by: Keyur Maru <kd2maru@gmail.com>

Release v0.0.7+1

Formatting-only release to meet pub.dev static analysis requirements.

Changes:
- Apply dart format to all files to meet pub.dev static analysis requirements

For full changelog, see: https://github.com/keyur2maru/vad/blob/master/CHANGELOG.md#0071

Release v0.0.7

Major update with Android 16KB page size support, custom audio streams, and architectural improvements.

Highlights:
- Add Android 16KB page size support (Android 15+ compatible)
- Now using Microsoft ONNX Runtime 1.22.0 directly via FFI (replaced third-party wrapper)
- Add support for custom audio streams
- Fix AudioRecorder disposal and recreation issue
- BREAKING CHANGE: Asset management - models now loaded from CDN by default
- BREAKING CHANGE: Model identifier renamed from 'legacy' to 'v4'
- BREAKING CHANGE: onEmitChunk stream type changed to include isFinal flag
- Internal architectural refactor for unified cross-platform implementation
- Add desktop platform support (Windows, macOS, Linux)
- Rewrite web VAD implementation in pure Dart

For full changelog, see: https://github.com/keyur2maru/vad/blob/master/CHANGELOG.md#007

pubspec: add homepage and issue_tracker

Signed-off-by: Keyur Maru <kd2maru@gmail.com>

ran dart format

Signed-off-by: Keyur Maru <kd2maru@gmail.com>

fix broken license hyperlink, add topics to pubspec.yaml and bump ver…

…sion to 0.0.2

Signed-off-by: Keyur Maru <kd2maru@gmail.com>