Refactor directory structure and split property group

[shibayan]

This pull request reorganizes the project structure to follow a more conventional layout, introduces centralized configuration files for build and package management, and updates documentation to reflect these changes. The key updates include moving source, test, and sample projects into src/, tests/, and samples/ directories, respectively, and adding shared configuration for nullable reference types and package version management.

Project structure reorganization:

• Moved main library, source generator, tests, and example projects into src/, tests/, and samples/ directories for improved clarity and maintainability. Updated references in Sharprompt.slnx, .github/workflows/publish.yml, and related documentation to match the new structure. [1] [2] [3] [4] [5]
• Removed the old Sharprompt.Example/Sharprompt.Example.csproj and added its replacement at samples/Sharprompt.Example/Sharprompt.Example.csproj with updated project references. [1] [2]

Centralized build and package management:

• Added Directory.Build.props to enable nullable reference types and embed source link information across all projects.
• Added Directory.Packages.props to manage NuGet package versions centrally, ensuring consistency and easier maintenance.

Project file cleanup:

• Cleaned up Sharprompt.SourceGenerator.csproj (now in src/) by removing redundant properties and relying on shared configuration from the new props files.

[Copilot]

Pull request overview

This PR reorganizes the Sharprompt project into a conventional src/, tests/, samples/ directory structure and centralizes build configuration. It also adds a comprehensive test suite and introduces the full library source code under the new directory layout.

Changes:

• Moved source projects to src/, test project to tests/, and example project to samples/, updating all project references, solution file, CI workflows, and documentation accordingly.
• Added Directory.Build.props (for shared Nullable, SourceLink settings) and Directory.Packages.props (for centralized NuGet package version management), removing redundant properties from individual .csproj files.
• Added extensive unit tests covering validators, options, internal types (Paginator, TextInputBuffer, Optional, etc.), fluent extensions, console driver interface, and key bindings.

Reviewed changes

Copilot reviewed 11 out of 86 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Sharprompt.slnx	Updated project paths to new src/, tests/, samples/ layout
Directory.Build.props	New shared build properties (Nullable, SourceLink)
Directory.Packages.props	New central package version management
src/Sharprompt/Sharprompt.csproj	Removed redundant props, updated relative paths for icon/README
src/Sharprompt.SourceGenerator/Sharprompt.SourceGenerator.csproj	Removed redundant props, versions now centralized
tests/Sharprompt.Tests/Sharprompt.Tests.csproj	Updated project reference path, centralized versions
samples/Sharprompt.Example/Sharprompt.Example.csproj	New sample project with updated references
Sharprompt.Example/Sharprompt.Example.csproj	Removed old project file
.github/workflows/publish.yml	Updated pack path to src/Sharprompt
README.md, CONTRIBUTING.md	Updated example project path references
src/Sharprompt/Strings/Resource.resx	Resource strings (English)
src/Sharprompt/Strings/Resource.ja.resx	Resource strings (Japanese)
src/Sharprompt/Strings/Resource.de-DE.resx	Resource strings (German)
src/Sharprompt/**	Full library source (forms, drivers, internals, options, fluent API, etc.)
tests/Sharprompt.Tests/**	Comprehensive test suite for validators, options, internals, fluent API, console driver

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