feat(gen): client request editor

[tdakkota]

Discussed in #1135

^{Originally posted by StringNick December 12, 2023}
I tried to research how i can integrate change header or add some logger as server middleware to client library in dev environments, and i researched now it's not possible, so is it possible to add something like oapi-codegen for client generated code, for editing request (for example add custom header, and etc).
Example editor for special route and call:

Example of global request editor for all calls:

client, clientErr := NewClient("", WithRequestEditorFn(someHeaderOrLogEditor))

It can help to add logger, to add custom debug headers that u cant specify in spec and etc.
Without this configuration its inpossible to use generator for client in my project, for server i saw solution about abstract on server interface, but for client nothing.
Thank you for attention

[tdakkota]

I think per-operation RequestEditor option is fine as an opt-in feature (e.g. client/request_editors).