Support subcommand

[walterlv]

No description provided.

[Copilot]

Pull Request Overview

This PR implements comprehensive support for subcommands (multi-level commands) in the command line parser library. The primary purpose is to allow commands like git remote add, docker container run, or kubectl cluster node delete to be properly parsed and handled.

Key changes include:

• Renamed VerbAttribute to CommandAttribute to better reflect the modern concept of main commands and subcommands
• Updated parsers to handle multi-level command names separated by spaces
• Enhanced command matching to support the longest possible command path

Reviewed Changes

Copilot reviewed 49 out of 51 changed files in this pull request and generated 3 comments.

File	Description
src/DotNetCampus.CommandLine/Compiler/VerbAttribute.cs	Renames VerbAttribute to CommandAttribute with space-separated command support
src/DotNetCampus.CommandLine/Utils/Parsers/*.cs	Updates all parsers to handle multi-level commands instead of single verbs
tests/DotNetCampus.CommandLine.Tests/SubcommandTests.cs	Adds comprehensive test suite for subcommand functionality
Various analyzer and generator files	Updates terminology and logic from "verb" to "command" throughout

Files not reviewed (2)

• samples/DotNetCampus.CommandLine.Sample/Properties/LocalizableStrings.Designer.cs: Language not supported
• src/DotNetCampus.CommandLine.Analyzer/Properties/Localizations.Designer.cs: Language not supported

Comments suppressed due to low confidence (2)

tests/DotNetCampus.CommandLine.Tests/PowerShellCommandLineParserTests.cs:1

• Assert.AreEqual on line 342 should use CollectionAssert.AreEqual for array comparison to avoid reference equality issues.

using System.Collections.Generic;

tests/DotNetCampus.CommandLine.Tests/FlexibleCommandLineParserTests.cs:694

• Calling Count() on IEnumerable causes enumeration twice (once for Count() and once for ToArray()). Consider using ToArray() first and checking its Length property.

    [TestMethod("11.3. 支持分号分隔的列表")]
    public void SemicolonSeparatedList_ParsedCorrectly()
    {
        // Arrange
        string[] args = ["--names:John;Jane;Doe"];
        IEnumerable<string>? names = null;

        // Act
        CommandLine.Parse(args, Flexible)
            .AddHandler<Flexible16_ListOptions>(o =>
            {
                names = o.Names;
                return 0;
            })
            .Run();

        // Assert
        Assert.IsNotNull(names);
        Assert.AreEqual(3, names.Count());
        CollectionAssert.AreEqual(new[] { "John", "Jane", "Doe" }, names.ToArray());
    }

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