feat: result type and typed throw support

[TheRogue76]

Need these since i am a huge fan of result types and typed throws (Good errors make good neighbours)

[Copilot]

Pull request overview

This PR adds support for Result types and Swift 6's typed throws syntax to SwiftMockk, enabling better error handling patterns in mocked protocols.

• Adds convenience DSL methods returnsSuccess() and returnsFailure() for stubbing Result-returning methods
• Implements full support for Swift 6's typed throws syntax throws(ErrorType) in protocol methods
• Updates swift-syntax dependency from 510.0.0 to 600.0.0 to leverage proper typed throws API support

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
Tests/SwiftMockkTests/SwiftMockkTests.swift	Adds comprehensive test coverage for Result type stubbing and typed throws scenarios including sync/async variants
Sources/SwiftMockkMacros/MockableMacro.swift	Implements typed throws detection and generates appropriate stub helper calls based on throw type
Sources/SwiftMockk/SwiftMockk.swift	Adds typed throws helper functions and Result type handling in dummy value generation
Sources/SwiftMockk/DSL/Stubbing.swift	Adds returnsSuccess() and returnsFailure() convenience methods for Result type stubbing
README.md	Documents Result type and typed throws features with examples and important usage notes
CLAUDE.md	Provides technical implementation details for Result and typed throws support
Package.swift	Updates swift-syntax dependency to 600.0.0 for typed throws API support
Package.resolved	Reflects swift-syntax version update to 600.0.1

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