feature - add convenience methods scope.getStates{orNull}

[beeth0ven]

Why

Since scope.get<States<T>>() is a high-frequency called api with flutter context. But the keystroke is not very smooth.

What

ScopeGetStatesX is an extension to ScopeGet that adds convenience methods like scope.getStates, scope.getStatesOrNull and scope.hasStates.

extension ScopeGetStatesX on ScopeGet {

  States<T>? getStatesOrNull<T>({
    Object? name,
  }) => getOrNull<States<T>>(name: name);

  States<T> getStates<T>({
    Object? name,
  }) => get<States<T>>(name: name);

  bool hasStates<T>({
    Object? name,
  }) => has<States<T>>(name: name);
}

How

Changes:

- scope.get<States<String>>();
+ scope.getStates<String>();

- scope.has<States<String>>();
+ scope.hasStates<String>();

With ScopeGetStatesX extension methods, the keystroke is much more smooth, which will bring better development experience.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (79f9004) 100.00% compared to head (56e5c78) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #182   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        39    +1     
  Lines          473       479    +6     
=========================================
+ Hits           473       479    +6     

Impacted Files	Coverage Δ
...c/dart_scope/scope_methods/scope_get_states_x.dart	100.00% <100.00%> (ø)

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