After commit d16ea0af, compiling the server using cmake fails with the
following error :
```
FAILED: service/CMakeFiles/service.dir/Dev/qos/service_level_controller.cc.o
...
/home/Scylla/scylladb/cql3/util.hh:21:10: fatal error: 'cql3/CqlParser.hpp' file not found
21 | #include "cql3/CqlParser.hpp"
| ^~~~~~~~~~~~~~~~~~~~
1 error generated.
```
Fix it by linking the cql3 to the service library.
Closesscylladb/scylladb#20805