citus packages include `columnar` and thus conflict with hydra

### What's wrong?

It seems that Hydra's columnar is using the same name as citus columnar

This may introduce a problem: you can not install `hydra` and `citus` packages simultaneously.

It's okay to choose one on the database `CREATE EXTENSION` level, but conflict during installation may be unnecessary.

```bash
file /usr/pgsql-15/share/extension/columnar--10.0-3--10.1-1.sql conflicts between attempted installs of hydra_15-1.0.0-1.el8.x86_64 and citus_15-12.0.0-1PGDG.rhel8.x86_64
file /usr/pgsql-15/share/extension/columnar--10.1-1--10.2-1.sql conflicts between attempted installs of hydra_15-1.0.0-1.el8.x86_64 and citus_15-12.0.0-1PGDG.rhel8.x86_64
file /usr/pgsql-15/share/extension/columnar--10.2-2--10.2-3.sql conflicts between attempted installs of hydra_15-1.0.0-1.el8.x86_64 and citus_15-12.0.0-1PGDG.rhel8.x86_64
file /usr/pgsql-15/share/extension/columnar--10.2-3--10.2-4.sql conflicts between attempted installs of hydra_15-1.0.0-1.el8.x86_64 and citus_15-12.0.0-1PGDG.rhel8.x86_64
file /usr/pgsql-15/share/extension/columnar--9.5-1--10.0-1.sql conflicts between attempted installs of hydra_15-1.0.0-1.el8.x86_64 and citus_15-12.0.0-1PGDG.rhel8.x86_64
file /usr/pgsql-15/include/server/citus_version.h conflicts between attempted installs of citus_15-devel-12.0.0-1PGDG.rhel8.x86_64 and hydra_15-1.0.0-1.el8.x86_64
```