riverpod_graph fails when run against example/marvel and example/pub about riverpod

[rrousselGit]

Using a constructor tear-off should be supported.

That's generally how NotifierProviders are used.

[freemansoft]

Found the problem with running graph against examples/marvel

marvel.dart:23 graph fails trying to find a build method with

final repositoryProvider = Provider(MarvelRepository.new);

marvel.dart:23 graph succeeds if MarvalRepository is 8initialized

final repositoryProvider = Provider((ref) => MarvelRepository(ref));

I can do a PR if this is the "right" way to fix this. Otherwise, the code that looks for build() method needs to be refactored.

[freemansoft]

PR #2786 fixes the issue where riverpod_graph doesn't handle xxx.new tearoffs

The problem analyzing examples/pub is not addressed in the PR. I believe the problem with examples/pub is that there is a provider missing the call method being checked against in the analyzer's visitInstanceCreationExpression. That leaves the node analyzed as an InstanceCreationExpressionImpl which is an unexpected type.