[feat] Add string with/without start at frame

[Cedri4]

Describe the problem

Add string: node where you add string if possible with start at frame and end at frame
Remove string: node where you remove string if possible with start at frame and end at frame
They work like replace string

Describe the solution you'd like

with start at frame and end at frame

Alternatives considered

No response

Additional context

No response

[melMass]

I will look into this tomorrow but I think as a separate node, do you have a specific use case that could help thinking about it?

[melMass]

Sorry I never looked into this! I think you can find much better approaches in the Fizz Nodes, I did not test them yet but they are used for prompt travel in animateDiff Evolved samples: https://github.com/FizzleDorf/ComfyUI_FizzNodes

I'll keep the issue open for now