Export handle_write_pre function

[chancez]

Closes #4

Example of my usage:

local function LspOrgImports()
  local cos = require("codeactions-on-save")
  cos.handle_write_pre({ "source.organizeImports" }, 0, 1000)
end

local function LspFixAll()
  local cos = require("codeactions-on-save")
  cos.handle_write_pre({ "source.fixAll" }, 0, 1000)
end


local function lspAttach(bufnr, client)
 ...
   if client.server_capabilities.documentFormattingProvider then
    vim.api.nvim_buf_create_user_command(bufnr, 'LspFormat', function() vim.lsp.buf.format() end, {})
    vim.api.nvim_buf_create_user_command(bufnr, 'LspOrgImports', function() LspOrgImports() end, {})
    vim.api.nvim_buf_create_user_command(bufnr, 'LspToggleAutoFormat', function() LspToggleAutoFormat() end, {})
    vim.api.nvim_buf_create_user_command(bufnr, 'LspToggleAutoFormatBuffer', function() LspToggleAutoFormat() end, {})

    vim.api.nvim_create_augroup('CodeFormat', { clear = false })
    vim.api.nvim_create_autocmd({ 'BufWritePre' }, {
      group = 'CodeFormat',
      buffer = bufnr,
      desc = 'Format code on save',
      callback = function()
        -- Check if autoformatting is enabled
        if not IsLspAutoFormatEnabled() then
          return
        end
        LspOrgImports()
        vim.lsp.buf.format()
      end,
    })
  end


end