feat: add prefer-define-hero-tag rule

[san-smith]

Issue: #1027

Please write a short comment explaining your change (or "none" for internal only changes)

Added new rule prefer-define-hero-tag.

Rule documentation

Good example

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

Bad example

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

[codecov]

Codecov Report

Merging #1184 (834cafb) into master (b902f36) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 834cafb differs from pull request most recent head d51593f. Consider uploading reports for the commit d51593f to get more accurate results

@@            Coverage Diff             @@
##           master    #1184      +/-   ##
==========================================
+ Coverage   86.21%   86.26%   +0.04%     
==========================================
  Files         359      361       +2     
  Lines        8133     8160      +27     
==========================================
+ Hits         7012     7039      +27     
  Misses       1121     1121              

Impacted Files	Coverage Δ
...c/analyzers/lint_analyzer/rules/rules_factory.dart	100.00% <ø> (ø)
...r_define_hero_tag/prefer_define_hero_tag_rule.dart	100.00% <100.00%> (ø)
...les/rules_list/prefer_define_hero_tag/visitor.dart	100.00% <100.00%> (ø)

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[incendial]

Great job! Left a few comments though.

[incendial]

Thank you for the contribution!