fix(toRouteMatcher): respect non strict trailing slash

[pi0]

🔗 Linked issue

resolves #87

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When creating router with default options, we loose the trailing slash status as it is non strict by default.

toRouteMatcher when extending router should respect same options and when matching routes.

Note: This does not include strictTrailingSlash in the export object but by default we assume to have consistent default behavior (not sensitive to trailing slashes). For v2, we might include it in export object maybe with an _* key if needed. /cc @danielroe

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.