fix: type helpers

[adamdehaven]

Response type helper

Update the generated client Response interface to include all valid 2xx response codes. Resolves #88.

RequestBody type helper

Also updates the client RequestBody interface to handle required and optional requestBody

// An operation with optional request body
type Operation1 = {
  requestBody?: { content: { 'application/json': { name: string } } }
}

// An operation with required request body
type Operation2 = {
  requestBody: { content: { 'application/json': { id: number } } }
}

// Original version:
type Test1 = Operation1['requestBody'] extends { content: { 'application/json': infer U } } ? U : never
// Result: never (fails)

// Updated version:
type Test2 = Operation1 extends { requestBody?: { content: { 'application/json': infer U } } } ? U : never
// Result: { name: string } (works)

The updated version works for both required and optional request bodies

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[adamdehaven]

@enkot this allows proper interfaces for non-200 responses, e.g. to support something like this:

// Assume this endpoint returns a `201` response code
const myApp: MyClientResponse<'create-application'> = {
  // interface now appears
}