patch 9.2.0371: filetype: ghostty config files are not recognized

Problem:  filetype: ghostty config files are not recognized
Solution: Detect ghostty configuration files as ghostty filetype,
          include a simple ghostty filetype plugin (Bez Hermoso)

closes: #20002

Co-authored-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Bez Hermoso <me@bez.dev>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/dist/ft.vim

@@ -3,7 +3,7 @@ vim9script
 # Vim functions for file type detection
 #
 # Maintainer:		The Vim Project <https://github.com/vim/vim>
-# Last Change:		2026 Apr 15
+# Last Change:		2026 Apr 20
 # Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 # These functions are moved here from runtime/filetype.vim to make startup
@@ -3113,7 +3113,9 @@ const ft_from_ext = {
   "bp": "bp",
   # Tiltfile
   "Tiltfile": "tiltfile",
-  "tiltfile": "tiltfile"
+  "tiltfile": "tiltfile",
+  # Ghostty
+  "ghostty": "ghostty",
 }
 # Key: file name (the final path component, excluding the drive and root)
 # Value: filetype