Add dynamic param suport for `.prefix`

[unnoq]

Describe the feature

Current limitations for generating specs and accessing dynamic parameters:

1. For generating specs: Instead of requiring dynamic parameters to exist in the .input schema, we can assume they expect a string type when we cannot infer it from the .input schema.

2. For accessing parameters: We can inject them into the context and access them through a unique symbol:

const router = os.prefix('/{organizationId}').use(({ next, context }) => {
    const organizationId: string | undefined = getDynamicParams(context).organizationId
    return next()
}).router({
    // ...
})

Note: .prefix only affects procedures with defined paths inside .router

Additional information

• Would you be willing to help implement this feature?