Allow use of --imply_local when calling DiffviewOpen, allowing LSP use and linting in MR review (#162)

Adds the ability to use the local filesystem when doing reviews by passing the `--imply-local` flag to the reviewer. This functionality is disabled by default. If users make changes to their filesystem (the files are "dirty") the default reviewer (hashes not files) will be use. This is a MINOR release.

README.md

@@ -103,6 +103,11 @@ require("gitlab").setup({
   config_path = nil, -- Custom path for `.gitlab.nvim` file, please read the "Connecting to Gitlab" section
   debug = { go_request = false, go_response = false }, -- Which values to log
   attachment_dir = nil, -- The local directory for files (see the "summary" section)
+  reviewer_settings = {
+    diffview = {
+      imply_local = false, -- If true, will attempt to use --imply_local option when calling |:DiffviewOpen|
+    },
+  },
   help = "?", -- Opens a help popup for local keymaps when a relevant view is focused (popup, discussion panel, etc)
   popup = { -- The popup for comment creation, editing, and replying
     exit = "<Esc>",