feat(nvim): add keybind to sync packer

.config/nvim/lua/plugins/mappings.lua

@@ -106,3 +106,19 @@ map('n', '<leader>sr', '', {
 map('v', '<leader>sr', '', {
     callback = run_snip
 })
+
+-- Packer Mappings
+local packer_sync = function ()
+    async.run(function ()
+        vim.notify.async('Syncing packer.', 'info', {
+            title = 'Packer'
+        })
+    end)
+    local snap_shot_time = os.date("!%Y-%m-%dT%TZ")
+    vim.cmd('PackerSnapshot ' .. snap_shot_time)
+    vim.cmd('PackerSync')
+end
+
+map('n', '<leader>ps', '', {
+    callback = packer_sync
+})