[New rule] prefer-define-hero-tag

[lsaudon]

Please describe what the rule should do:

Please describe what the rule should do:
The rule should tell us to give a heroTag to the widget that supports it to avoid a FlutterError.

What category of rule is this? (place an "X" next to just one item)

• Warns about a potential error (problem)
• Suggests an alternate way of doing something (suggestion)
• Other (please specify:)

Provide 2-3 code examples that this rule will warn about (it will be better if you can provide both good and bad examples):

❌ Bad:

FloatingActionButton(
  onPressed: () => context.read<CounterCubit>().increment(),
  child: const Icon(Icons.add),
), // LINT

✅ Good:

FloatingActionButton(
  heroTag: 'increment_heroTag',
  onPressed: () => context.read<CounterCubit>().increment(),
  child: const Icon(Icons.add),
),

Are you willing to submit a pull request to implement this rule?

No, too complex for me.

[incendial]

@lsaudon I thought that this tag is an optional thing and the rule will lead to a lot of false-positives. Or l'm wrong?

[lsaudon]

When heroTag is not set, then a default heroTag is set.
If you have 2 widgets with default heroTag, when you go on the page, you have an error.
I don't know about false positives.