Add attribute alternatives for primitive and server configuration

[pushpak1300]

Following the Laravel ecosystem direction (framework PR #58578), this adds Attributes as a non-breaking alternative to class properties for configuring MCP primitives and servers.

Usage

// Before (properties — still works)
class SayHelloTool extends Tool
{
    protected string $name = 'say-hello';
    protected string $description = 'Greets the user';
}

// After (attributes)
#[Description('Greets the user')]
class SayHelloTool extends Tool
{
    // name auto-derived from class name
}

// Resources
#[Uri('file://logs/application')]
#[MimeType('text/plain')]
class ApplicationLog extends Resource {}

// Servers
#[Name('My App')]
#[Version('1.0.0')]
#[Instructions('Use this server to interact with the app')]
class AppServer extends Server {}

Approach

• Seven new attribute classes: Name, Title, Description, Uri, MimeType, Version, Instructions
• A shared ReadsAttributes trait resolves attribute values via reflection
• Primitive, Resource, and Server accessor methods check attributes first, then fall back to properties, then to auto-generated defaults
• Fully non-breaking — all existing tests pass unchanged