feat(null_ls_deps): add gofumpt and gopls (ayamir#996)

* feat(completion): use gofumpt to format Go code, run goimports on save

* chore(deps): sort null_ls deps

---------

Co-authored-by: Jint-lzxy <50296129+Jint-lzxy@users.noreply.github.com>

lua/core/settings.lua

@@ -90,7 +90,7 @@ settings["server_formatting_block_list"] = {
 -- Set the language servers that will be installed during bootstrap here.
 -- check the below link for all the supported LSPs:
 -- https://github.com/neovim/nvim-lspconfig/tree/master/lua/lspconfig/server_configurations
-settings["lsp"] = {
+settings["lsp_deps"] = {
   "bashls",
   "clangd",
   "gopls",
@@ -109,6 +109,8 @@ settings["null_ls_deps"] = {
   -- formatting
   "black",
   "clang_format",
+	"gofumpt",
+	"goimports",
   "eslint_d",
   "jq",
   "markdownlint",