Fix start local audio

[hiroshihorie]

Ensure native ADM is started when track.start() is called so audio frames get generated (for visualizer)
Also expose manual adm start/stop methods.

[github-actions]

Caution

Breaking change detected without major changeset

dart-apitool detected the following breaking changes:

Preparing git repository: https://github.com/livekit/client-sdk-flutter
Using ref: main
Cloning git repository: https://github.com/livekit/client-sdk-flutter
Checking out ref: main
Successfully cloned to: /tmp/BMTDUA
Preparing package dependencies for git package https://github.com/livekit/client-sdk-flutter (forced Flutter)
Resolving dependencies...
Downloading packages...
  _fe_analyzer_shared 85.0.0 (98.0.0 available)
  analyzer 7.7.1 (12.0.0 available)
  async 2.13.0 (2.13.1 available)
  build 2.5.4 (4.0.5 available)
  build_config 1.1.2 (1.3.0 available)
  build_resolvers 2.5.4 (3.0.4 available)
  build_runner 2.5.4 (2.13.1 available)
  build_runner_core 9.1.2 (9.3.2 available)
  built_value 8.12.4 (8.12.5 available)
  dart_style 3.1.1 (3.1.8 available)
  dart_webrtc 1.8.0 (1.8.1 available)
  flutter_webrtc 1.4.0 (1.4.1 available)
  json_annotation 4.9.0 (4.11.0 available)
  json_serializable 6.9.5 (6.13.1 available)
  meta 1.17.0 (1.18.2 available)
  mockito 5.4.6 (5.6.4 available)
  path_provider_android 2.2.22 (2.2.23 available)
  source_gen 2.0.0 (4.2.2 available)
  source_helper 1.3.7 (1.3.11 available)
  test_api 0.7.10 (0.7.11 available)
  vector_math 2.2.0 (2.3.0 available)
  win32 5.15.0 (6.0.0 available)
  win32_registry 2.1.0 (3.0.2 available)
Got dependencies!
23 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
Resolving dependencies in `./example`...
Downloading packages...
Got dependencies in `./example`.
Preparing . (forced Flutter)
Copying sources from .
Preparing package dependencies for local package . (forced Flutter)
Resolving dependencies...
Downloading packages...
  _fe_analyzer_shared 85.0.0 (98.0.0 available)
  analyzer 7.7.1 (12.0.0 available)
  async 2.13.0 (2.13.1 available)
  build 2.5.4 (4.0.5 available)
  build_config 1.1.2 (1.3.0 available)
  build_resolvers 2.5.4 (3.0.4 available)
  build_runner 2.5.4 (2.13.1 available)
  build_runner_core 9.1.2 (9.3.2 available)
  built_value 8.12.4 (8.12.5 available)
  dart_style 3.1.1 (3.1.8 available)
  dart_webrtc 1.8.0 (1.8.1 available)
  flutter_webrtc 1.4.0 (1.4.1 available)
  json_annotation 4.9.0 (4.11.0 available)
  json_serializable 6.9.5 (6.13.1 available)
  meta 1.17.0 (1.18.2 available)
  mockito 5.4.6 (5.6.4 available)
  path_provider_android 2.2.22 (2.2.23 available)
  source_gen 2.0.0 (4.2.2 available)
  source_helper 1.3.7 (1.3.11 available)
  test_api 0.7.10 (0.7.11 available)
  vector_math 2.2.0 (2.3.0 available)
  win32 5.15.0 (6.0.0 available)
  win32_registry 2.1.0 (3.0.2 available)
Got dependencies!
23 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
Resolving dependencies in `./example`...
Downloading packages...
Got dependencies in `./example`.
Omitting pub get (package config already present)
Analyzing /tmp/BMTDUA
Omitting pub get (package config already present)
Analyzing .
Cleaning up
Cleaning up
Checking Package version
ignoring prerelease
-- Generating report using: Console Reporter --
BREAKING CHANGES
├─┬ Class Track
│ ├── Field "isStarted" added (required) (CF02)
│ └── Field "isMuted" added (required) (CF02)
└─┬ Class LocalTrack
  ├── Field "isStarted" added (required) (CF02)
  └── Field "isMuted" added (required) (CF02)
Non-Breaking changes
├─┬ Class RemoteTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
├─┬ Class LocalVideoTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
├─┬ Class VideoTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
├─┬ Class LocalAudioTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
├─┬ Class AudioTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
├─┬ Class Hardware
│ ├── Method "startLocalRecording" added (CE11) (minor)
│ └── Method "stopLocalRecording" added (CE11) (minor)
├─┬ Class RemoteAudioTrack
│ ├── Field "isStarted" added (CF02) (minor)
│ └── Field "isMuted" added (CF02) (minor)
└─┬ Class RemoteVideoTrack
  ├── Field "isStarted" added (CF02) (minor)
  └── Field "isMuted" added (CF02) (minor)
To learn more about the detected changes visit: https://github.com/bmw-tech/dart_apitool/blob/main/readme/change_codes.md
Version Check
New Version is too low!

Old version: "2.7.0"
New version: "2.7.0"
Needed version: "3.0.0"

Got "2.7.0" expected >= "3.0.0" (breaking changes)

If this is intentional, please add a changeset with major level in .changes/:

major type="changed" "Description of breaking change"