vim-patch:9.1.0279: filetype: roc files are not recognized

Problem:  filetype: roc files are not recognized
Solution: Detect '*.roc' files as roc filetype,
          add a basic filetype plugin (nat-418)

closes: vim/vim#14416

196b6678c5

Co-authored-by: nat-418 <93013864+nat-418@users.noreply.github.com>

runtime/lua/vim/filetype.lua

@@ -887,6 +887,7 @@ local extension = {
   Snw = 'rnoweb',
   robot = 'robot',
   resource = 'robot',
+  roc = 'roc',
   ron = 'ron',
   rsc = 'routeros',
   x = 'rpcgen',