feat: introduce route utility types for improved DX

[istiak-tridip]

This PR introduces and exports three new utility types:

• RouteDefinition
• RouteFormDefinition
• RouteQueryOptions

Why?

• Enhanced DX: Allows end-users to import and utilize these types in their projects for better type safety, autocompletion, and easier integration.

  import type { RouteDefinition } from '@/wayfinder';
  
  function sendRequest(route: RouteDefinition<'post'>) { /* ... */ }
  
  sendRequest(StorePostController());

• Cleaner Generated Code: The generated code now uses these shared types, improving the output's readability.

Thanks 🙏

[joetannenbaum]

I dig it, thanks!