allow to add annotations for routes for generated client

[miki725]

it would be useful to add annotations which will persist in the generated client similarly to how route can be annotated for the generated docs (e.g. tags)

express-zod-api/example/example.client.ts

Lines 114 to 118 in 602f6f3

	export const jsonEndpoints = {
	"get /v1/user/retrieve": true,
	"post /v1/user/:id": true,
	"post /v1/avatar/upload": true,
	};

currently generated client only has a single js-exported constant jsonEndpoints which enumerates all endpoints where the value is true. it would be nice to be able to add custom annotations to either the same constant or another exported constant with custom metadata about the endpoint the client can take into account when making requests to the api. perhaps something like:

const helloWorldEndpoint = defaultEndpointsFactory.build({
  ...,
  annotations: {
    foo: "bar"
  }
});

[RobinTail]

Hello @miki725 ,

could you please clarify what kind of things could go to such annotations to be useful for the client in order to request the endpoint?