chore: add class annotation for Path (#292)

Author: dchinmay2

lua/plenary/path.lua

@@ -146,6 +146,7 @@ end
 -- S_IFLNK  = 0o120000  # symbolic link
 -- S_IFSOCK = 0o140000  # socket file
 
+---@class Path
 local Path = {
   path = path,
 }