Enumerize all fonts

[YukiAttano]

Package

google_fonts

Description

Is your feature request related to a problem? Please describe.
I would like to access all fonts in a simple list like "GoogleFonts.fonts".
Therefor the only function to achieve something like this is "GoogleFonts.asMap()" which returns all fonts as String/Builder Function pair.

Describe the solution you'd like
Wouldn't it be easier for the whole library to put all fonts in enumes?
like

 typedef TextStyleBuilder = TextStyle Function({
  TextStyle? textStyle,
  Color? color,
  Color? backgroundColor,
  double? fontSize,
  FontWeight? fontWeight,
  FontStyle? fontStyle,
  double? letterSpacing,
  double? wordSpacing,
  TextBaseline? textBaseline,
  double? height,
  Locale? locale,
  Paint? foreground,
  Paint? background,
  List<ui.Shadow>? shadows,
  List<ui.FontFeature>? fontFeatures,
  TextDecoration? decoration,
  Color? decorationColor,
  TextDecorationStyle? decorationStyle,
  double? decorationThickness,
});


enum GoogleFont {
  ABeeZee,
  ADLaM_Display;
  // ...

  final String name;
  final TextStyleBuilder builder;
}

This way, one could easily retrieve a list of all fonts, could check if a given font is valid and pass the font typesafe around instead of holding a String.

Describe alternatives you've considered
Possibly another "improvement" (excuse me that i don't open another issue for that) would be to reduce the "static TextTheme almaraiTextTheme([TextTheme? textTheme])" TextThemeBuilder functions that are probably auto generated, with a simple callback like:

// Example almari function:
  static TextTheme almaraiTextTheme([TextTheme? textTheme]) {
    textTheme ??= ThemeData.light().textTheme;
    return TextTheme(
      displayLarge: almarai(textStyle: textTheme.displayLarge),
      displayMedium: almarai(textStyle: textTheme.displayMedium),
      displaySmall: almarai(textStyle: textTheme.displaySmall),
      headlineLarge: almarai(textStyle: textTheme.headlineLarge),
      headlineMedium: almarai(textStyle: textTheme.headlineMedium),
      headlineSmall: almarai(textStyle: textTheme.headlineSmall),
      titleLarge: almarai(textStyle: textTheme.titleLarge),
      titleMedium: almarai(textStyle: textTheme.titleMedium),
      titleSmall: almarai(textStyle: textTheme.titleSmall),
      bodyLarge: almarai(textStyle: textTheme.bodyLarge),
      bodyMedium: almarai(textStyle: textTheme.bodyMedium),
      bodySmall: almarai(textStyle: textTheme.bodySmall),
      labelLarge: almarai(textStyle: textTheme.labelLarge),
      labelMedium: almarai(textStyle: textTheme.labelMedium),
      labelSmall: almarai(textStyle: textTheme.labelSmall),
    );
  }

// to:
 static TextTheme almaraiTextTheme([TextTheme? textTheme]) {
    textTheme ??= ThemeData.light().textTheme;
    return googleFontTextTheme(GoogleFont.almari);
 }

static TextTheme googleFontTextTheme(TextStyleBuilder builder, [TextTheme? textTheme]) {
  textTheme ??= ThemeData.light().textTheme;

  return TextTheme(
      displayLarge: builder(textStyle: textTheme.displayLarge),
      displayMedium: builder(textStyle: textTheme.displayMedium),
      displaySmall: builder(textStyle: textTheme.displaySmall),
      headlineLarge: builder(textStyle: textTheme.headlineLarge),
      headlineMedium: builder(textStyle: textTheme.headlineMedium),
      headlineSmall: builder(textStyle: textTheme.headlineSmall),
      titleLarge: builder(textStyle: textTheme.titleLarge),
      titleMedium: builder(textStyle: textTheme.titleMedium),
      titleSmall: builder(textStyle: textTheme.titleSmall),
      bodyLarge: builder(textStyle: textTheme.bodyLarge),
      bodyMedium: builder(textStyle: textTheme.bodyMedium),
      bodySmall: builder(textStyle: textTheme.bodySmall),
      labelLarge: builder(textStyle: textTheme.labelLarge),
      labelMedium: builder(textStyle: textTheme.labelMedium),
      labelSmall: builder(textStyle: textTheme.labelSmall),
    );
 }

Additional context
I am interested if this is an option and why it is currently made the way it is, which looks like a lot of boilerplate for every single GoogleFont for me.