patch 9.0.1891: No runtime support for Mojo

Problem:  No runtime support for Mojo
Solution: Add basic filetype and syntax plugins

closes: #13062
closes: #13063

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Co-authored-by: Mahmoud Abduljawad <mahmoud@masaar.com>

src/testdir/test_filetype.vim

@@ -456,6 +456,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     mrxvtrc: ['mrxvtrc', '.mrxvtrc'],
     msidl: ['file.odl', 'file.mof'],
     msql: ['file.msql'],
+    mojo: ['file.mojo', 'file.🔥'],
     mupad: ['file.mu'],
     mush: ['file.mush'],
     muttrc: ['Muttngrc', 'Muttrc', '.muttngrc', '.muttngrc-file', '.muttrc',

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1891,
 /**/
     1890,
 /**/