Cannot connect to ClickHouse using elixir postgrex

Hi there,

Reference issue:

- https://github.com/elixir-ecto/postgrex/issues/665
- https://github.com/questdb/questdb/issues/3033

One cannot connect to questDB using the postgrex library which expects tables such as:

- pg_type
- pg_attributes

to be present.

**Use case**

I can use the exist PostgreSQL Elixir implementation to access ClickHouse.

**Describe the solution you'd like**

Implement the tables:

- pg_type
- pg_attributes

**Describe alternatives you've considered**

_No response_

**Additional context**

_No response_