Add `desc` field to keymaps

[dpetka2001]

Describe the solution you'd like
It would be awesome if keymaps could also accept a desc field.

That would mean that probably the structure would have to change for the current callback to be a table instead of a function, so it accepts multiple fields that can be used in vim.keymap.set. Currently this is the diff I made locally, but because I am new to programming I'm not that confident to create a PR for this and maybe there are other side-effects I'm not able to think of, but I believe should give you the gist about what has to change in general

diff --git a/lua/vgit/core/keymap.lua b/lua/vgit/core/keymap.lua
index e3720b7..393ee57 100644
--- a/lua/vgit/core/keymap.lua
+++ b/lua/vgit/core/keymap.lua
@@ -12,17 +12,18 @@ local function parse_commands(commands)
   return parsed_commands
 end
 
-function keymap.set(mode, key, callback)
+function keymap.set(mode, key, callback, desc)
   if type(callback) == 'string' then
     vim.api.nvim_set_keymap(mode, key, string.format('<Cmd>lua require("vgit").%s()<CR>', callback), {
       noremap = true,
       silent = true,
+      desc = desc,
     })
 
     return keymap
   end
 
-  vim.keymap.set(mode, key, callback, { silent = true, noremap = true })
+  vim.keymap.set(mode, key, callback, { desc = desc, silent = true, noremap = true })
 
   return keymap
 end
@@ -36,7 +37,14 @@ end
 function keymap.define(keymaps)
   for commands, callback in pairs(keymaps) do
     commands = parse_commands(commands)
-    keymap.set(commands[1], commands[2], callback)
+    local desc = nil
+    if type(callback) == 'table' then
+      desc = callback.desc
+      callback = callback[1]
+      keymap.set(commands[1], commands[2], callback, desc)
+    else
+      keymap.set(commands[1], commands[2], callback)
+    end
   end
 
   return keymap