Better modularization of request/response logic

[deyaaeldeen]

The modular code generator generates the following function to handle processing the response:

autorest.typescript/packages/typespec-test/test/openai_modular/generated/typespec-ts/src/api/operations.ts

Line 53 in b941319

export async function _getEmbeddingsDeserialize(

and it mainly checks if the response is unexpected:

autorest.typescript/packages/typespec-test/test/openai_modular/generated/typespec-ts/src/api/operations.ts

Line 56 in b941319

if (isUnexpected(result)) {

and create the output object:

autorest.typescript/packages/typespec-test/test/openai_modular/generated/typespec-ts/src/api/operations.ts

Line 60 in b941319

return {

The two parts can be refactored into two separate functions. I need the function that just creates the output object to call it to deserialize server-sent events. That will save me from doing it manually, see https://github.com/Azure/azure-sdk-for-js/blob/cbbcc187abee610b7b11c1be7858a3bbee1d6fe2/sdk/openai/openai/src/api/operations.ts#L572 for an example.