buffers picker: add select_current option (PR included)

[dam9000]

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

With the buffers picker I'd like the current buffer to be pre-selected, but I don't like the buffer list to be mru sorted.
So that I can either navigate to nearby buffers using arrow keys or do a fuzzy search as usual.

Describe the solution you'd like

add select_current option to buffers picker.

Describe alternatives you've considered

none

Additional context

I opened a PR with the proposed change:

#2918

Example usage:

    vim.keymap.set('n', '<M-b>', function()
    require('telescope.builtin').buffers {
        select_current = true,
        selection_strategy = 'closest',
    }
    end, { desc = 'Buffer list' })

[pirey]

the select_current option is not working as expected.
it does not select current buffer by default.
i created a PR to fix it in #3147

[dam9000]

@pirey thanks for improving this. I too noticed that in some occasions it was not working properly, from my observations it was working only for the files that were provided through the command line but not for any new files opened afterwards from within nvim. I have tested your PR and now that works too.
Thank you!