[clang-format] [reflection] Missing space between `typename` and splicer

Currently formatted code (clang-format 21.1.8):
```
int main() {
typename[:^^int:] i = 42;
typename int i = 42;
}
```

Expected:
```
int main() {
typename [:^^int:] i = 42;
typename int i = 42;
}
```

Splicer `[:` `:]` is not recognized and no space is added after `typename`.
It seems reasonable to have the same formatting whether the type is spellt out explicitly or it comes from a splicer.