runtime(vim): Update base syntax and generator, improve command/function distinction

- Match Ex command modifiers and functions with the same name correctly.
  E.g., :browse and browse().
- Match full :eval command.

closes: #17789

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim9_function_call.vim

@@ -297,6 +297,7 @@ g:substitute#substitute()
 # chained function calls
 
 module.foo().bar()
+module.foo().substitute()
 
 
 # Issue 16721 (Vim script highlight of builtin function after |)
@@ -312,4 +313,5 @@ if !isdirectory(&directory) | mkdir(&directory, "p") | endif
 # Issue #17766 (valid function call highlighted as error)
 
 module[0].foo()
+module[0].substitute()