vim-patch:9.1.1468: filetype: bright(er)script files are not recognized

Problem:  filetype: bright(er)script files are not recognized
Solution: detect *.bs files as brighterscript filetype and *.brs as
          brightscript filetype, include filetype plugins (Riley Bruins)

closes: vim/vim#17566

03e5ee25fd

Co-authored-by: Riley Bruins <ribru17@hotmail.com>

runtime/lua/vim/filetype.lua

@@ -258,6 +258,8 @@ local extension = {
   bl = 'blank',
   blp = 'blueprint',
   bp = 'bp',
+  bs = 'brighterscript',
+  brs = 'brightscript',
   bsd = 'bsdl',
   bsdl = 'bsdl',
   bst = 'bst',