feat: Allow passing uri directly to Spookie

[codekeyz]

Description

Resolves: #110

We should be able to pass a URI directly to Spookie.

    await Spookie.uri(Uri(scheme: 'http', host: 'localhost', port: 5000))
            .post('/hello', {})
            .expectBody('Active Server')
            .expectStatus(200)
            .test();

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore