refactor: commands runner (#42)

* feat(utils): first impl of own commands runner

* refactor(gotests): uses own runner instead of vendored

* refactor(utils): back to plenary.job

* refactor(gotests): use new runner, clean code

* fix(runner): now it returns output correctly

* refactor(iferr): use vim.system

i have tried to use _utils.runner, but i can't figure out how to make `< file.go` for the command

* refactor(impl): use new runner

* refactor(installer): use new runner

* refactor(struct_tags): use new runner

* refactor: commands such as :GoGet runs with new runner

* refactor: throw errors in more lua way, i think

* refactor(utils): notify now has title

* refactor: use more correct way of notifying

* refactor(runner): write error message on error

lua/gopher/_utils/init.lua

@@ -1,5 +1,7 @@
 local utils = {}
 
+local TITLE = "gopher.nvim"
+
 ---@param t table
 ---@return boolean
 function utils.is_tbl_empty(t)
@@ -10,13 +12,24 @@ function utils.is_tbl_empty(t)
 end
 
 ---@param msg string
----@param lvl any
+---@param lvl number
 function utils.deferred_notify(msg, lvl)
   vim.defer_fn(function()
-    vim.notify(msg, lvl)
+    vim.notify(msg, lvl, {
+      title = TITLE,
+    })
   end, 0)
 end
 
+---@param msg string
+---@param lvl? number
+function utils.notify(msg, lvl)
+  lvl = lvl or vim.log.levels.INFO
+  vim.notify(msg, lvl, {
+    title = TITLE,
+  })
+end
+
 -- safe require
 ---@param  module string module name
 function utils.sreq(module)