feature: add flip_columns setting

[searleser97]

Did you check the docs?

• I have read all the sidekick.nvim docs

Is your feature request related to a problem? Please describe.

yes, right now I cannot switch between vertical and horizontal monitors with ease. nvim-telescope, fzf-lua, magenta.nvim, support a way to dynamically switching between different layouts.

Describe the solution you'd like

be able to switch layouts dynamically based on the result of a function defined in the config.

Describe alternatives you've considered

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Additional context

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