feat: Show contextual message on command usage exceptions

[renancaraujo]

Description

When a usage exception occurs inside a lead command, the CLI currently outputs the from the root command with description. This PR changes to show a more contextual error message:

Before:

$ very_good create --template xacalaca

"xacalaca" is not an allowed value for option "template".

🦄 A Very Good Command Line Interface

Usage: very_good <command> [arguments]

Global options:
-h, --help           Print this usage information.
    --version        Print the current version.
    --analytics      Toggle anonymous usage statistics.

          [false]    Disable anonymous usage statistics
          [true]     Enable anonymous usage statistics

Available commands:
  create     very_good create <output directory>
             Creates a new very good project in the specified directory.
  packages   Command for managing packages.
  test       Run tests in a Dart or Flutter project.

Run "very_good help <command>" for more information about a command.

Now:

$ very_good create --template xacalaca

"xacalaca" is not an allowed value for option "template".

Usage: very_good create <output directory>
-h, --help                    Print this usage information.
    --project-name            The project name for this new project. This must be a valid dart package name.
    --desc                    The description for this new project.
                              (defaults to "A Very Good Project created by Very Good CLI.")
    --org-name                The organization for this new project.
                              (defaults to "com.example.verygoodcore")
-t, --template                The template used to generate this new project.

          [core] (default)    Generate a Very Good Flutter application.
          [dart_pkg]          Generate a reusable Dart package.
          [flutter_pkg]       Generate a reusable Flutter package.
          [flutter_plugin]    Generate a reusable Flutter plugin.

    --android                 The plugin supports the Android platform.
                              (defaults to "true")
    --ios                     The plugin supports the iOS platform.
                              (defaults to "true")
    --web                     The plugin supports the Web platform.
                              (defaults to "true")
    --linux                   The plugin supports the Linux platform.
                              (defaults to "true")
    --macos                   The plugin supports the macOS platform.
                              (defaults to "true")
    --windows                 The plugin supports the Windows platform.
                              (defaults to "true")

Run "very_good help" to see global options.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[wolfenrain]

LGTM! That is so much cleaner!

[felangel]

💯