1.1.0

Requires Dart 3.3

• Migrate to fetch_api 2.0.0.
  This requires Dart 3.3, but makes package WASM ready.
• Update http constraint to ^1.2.0.
• BREAKING: FetchResponse url now is Uri instead of String.
• FetchResponse now implements BaseResponseWithUrl.
• Fix unclosed requests after client is closed in-between fetch request.
• Fix HEAD request in FireFox.
• Handle response length checks.
• Add FetchRequest class that wraps other Request to provide fetch options
  overrides.
• Removed integrity from FetchClient constructor as it wasn't used, use
  FetchRequest.integrity instead.