Feat: Improve Logging for Go Server (#68)

This MR adds an optional `debug` object to the configuration table to help users debug any connectivity issues with Gitlab. The table lets you log the requests and responses from the Go server.

lua/gitlab/state.lua

@@ -7,8 +7,9 @@ local u                  = require("gitlab.utils")
 local M                  = {}
 
 -- These are the default settings for the plugin
-M.settings = {
+M.settings               = {
   port = nil, -- choose random port
+  debug = { go_request = false, go_response = false },
   log_path = (vim.fn.stdpath("cache") .. "/gitlab.nvim.log"),
   reviewer = "delta",
   attachment_dir = "",