Contributes to: https://github.com/flutter/flutter/issues/135856

This PR also adds transitive dependency on  web_socket_channel, crypto, typed_data. `web_socket_channel` is needed to request retaining path for not GCed objects from VM Service. Two others are needed to serve web_socket_channel.

The dependency on leak_tracker is pinned:
https://github.com/flutter/flutter/blob/aea562114c4d8c220c9079e82d89a7da4164409f/packages/flutter_tools/lib/src/commands/update_packages.dart#L40