feature(picker): Configurable smart picker

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Did you check the docs?

• I have read all the snacks.nvim docs

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

I'd like the smart picker, when showing buffers, to be able to ignore the current buffer.

Describe the solution you'd like

To have the default when buffers is invoked from the smart picker to ignore current buffer - either by default or with some configuration.

More generally, the smart picker has little configuration. My request is that each of the pickers that the smart picker invokes can be passed configuration. Maybe something such as opts = { buffers = {buffers_opts}, files = {...}}

Describe alternatives you've considered

Writing my own smart picker.

Additional context

No response