add prehook option for agile setup

[Dehta-Hun]

My use case was that I didn't want plugin to work on specific buffer which I could determine only by name of it

like this:

      prehook = function(bufnr)
        local bufname = vim.api.nvim_buf_get_name(bufnr)
        if bufname:match("/%[dap.*") then
          return false -- disable scrollEOF for this buffer
        end
        return true
      end,

[zeevenn]

Try disabled_filetypes?

[Dehta-Hun]

Try disabled_filetypes?

Well yeah, but I wasn't been able to determine file type of buffer (if there is any)
Buffer is created by dap-neotest, having unique name each time by having a prefix number at the end