Feature Requst: Ability to save custom prompts

[cstroliadavis]

Description:

I would like to be able to make and use my own custom prompts.

It might be useful to do #968 first, as that could lay the groundwork for displaying and using custom prompts.

Reason:

I frequently find myself reaching for common prompts that I have found useful n the past. I will usually take those and tweak them a bit and use them for numerous other things.

We do have modes, and that is useful, but I find that modes come with a lot of baggage. When you create a mode, you end up saving all the other things that go along with it like model and rules, etc. Sometimes I want to use various custom prompts within a particular mode, rather than creating numerous modes with the same starting prompt (that is different from the shared prompt).

Example:

NOTE: the following example includes some demo for some additional features I would like to include later. I think the scope might be too large to do it all at once.

I just jotted down the idea below, but I have another idea:

It might be better to use a control like the one we do in Provider settings: