SimpleChat v3.1: Boolean chat request options in Settings UI, cache_prompt (#7950)

SimpleChat v3.1: Boolean chat request options in Settings UI, cache_prompt (#7950)

* SimpleChat: Allow for chat req bool options to be user controlled

* SimpleChat: Allow user to control cache_prompt flag in request

* SimpleChat: Add sample GUI images to readme file

Show the chat screen and the settings screen

* SimpleChat:Readme: Add quickstart block, title to image, cleanup

* SimpleChat: RePosition contents of the Info and Settings UI

Make it more logically structured and flow through.

* SimpleChat: Rename to apiRequestOptions from chatRequestOptions

So that it is not wrongly assumed that these request options are
used only for chat/completions endpoint. Rather these are used
for both the end points, so rename to match semantic better.

* SimpleChat: Update image included with readme wrt settings ui

* SimpleChat:ReadMe: Switch to webp screen image to reduce size