Trim spaces and new lines in the outputs

[kyteinsky]

Describe the feature you'd like to request

Outputs vary depending on the LLM used but most of them provide unsanitised texts with multiple spaces and/or new lines in the beginning and end of the output text. This can be trimmed for a better presentation.

Describe the solution you'd like

It can be trimmed in the assistant or in the text processing manager itself. I am not sure which is better.

Describe alternatives you've considered

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