supabase / supabase-flutter / 29094527665

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feat(postgrest): abort requests (#1368)

## What kind of change does this PR introduce?

feature

## What is the current behavior?

One cannot abort a started http request. Even by adding a `.timeout` to
the feature only ignores the result of the future but does not cancel
its execution.

## What is the new behavior?

Starting with `http` v1.5.0` it is now possible to abort requests.

```dart
final abortCompleter = Completer<void>();
Timer(Duration(seconds: 5), () => abortCompleter.complete());
try {
  final response = await client
  .from('table')
  .select()
  .abortCompleter(abortCompleter);
} on RequestAbortedException catch (e) {
 print('Request was aborted: $e');
}
```

Supabase-js uses `.abortSignal`, but since the dart implementation uses
futures/completer I switched to `.abortCompleter`. But I'm not entirely
sure and open for discussion about choosing a different name.

related: #898 
The issue covers the general feature to abort requests, so we can cover
aborting the requests in functions in another pr.

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