vim-patch:9.1.0874: filetype: karel files are not detected

Problem:  filetype: karel files are not detected
Solution: detect '*.kl' files as karel filetype,
          include syntax and filetype plugin
          (Kirill Morozov)

closes: vim/vim#16075

fdac54d7bb

Co-authored-by: Kirill Morozov <kirill@robotix.pro>
Co-authored-by: KnoP-01 <knosowski@graeffrobotics.de>

runtime/lua/vim/filetype.lua

@@ -653,6 +653,8 @@ local extension = {
   jsp = 'jsp',
   jl = 'julia',
   just = 'just',
+  kl = 'karel',
+  KL = 'karel',
   kdl = 'kdl',
   kv = 'kivy',
   kix = 'kix',