Feature: Handle Composite Types

### Feature description

I have a project that I would like to use conduit for but it makes use of composite types e.g.

```
CREATE TYPE public.money_with_currency AS (currency_code char(3), amount numeric(20,8))
```

When I attempt to start to run a pipeline, I receive:

```
ERR node stopped error="node pg-to-log:pg stopped with error: source stream was stopped unexpectedly: error reading from source: read plugin error: failed to fetch next record: fetchers exited unexpectedly: fetcher for table \"payment_transactions\" exited: failed to fetch results: failed to extract schemas: failed to extract payload schema for table payment_transactions: field \"amount\" with OID 20272 cannot be resolved" component=lifecycle.Service node_id=pg-to-log:pg stack=[{"file":"/private/tmp/conduit-20250320-4805-o24r34/conduit-0.13.3/pkg/lifecycle/service.go","func":"github.com/conduitio/conduit/pkg/lifecycle.(*Service).runPipeline.func2","line":743},{"file":"/private/tmp/conduit-20250320-4805-o24r34/conduit-0.13.3/pkg/lifecycle/stream/source.go","func":"github.com/conduitio/conduit/pkg/lifecycle/stream.(*SourceNode).Run","line":146},{"file":"/private/tmp/conduit-20250320-4805-o24r34/conduit-0.13.3/pkg/lifecycle/stream/source.go","func":"github.com/conduitio/conduit/pkg/lifecycle/stream.(*SourceNode).Run.func1","line":90}]
```

Since it's possible to list the composite types that have been created detailed here: https://dba.stackexchange.com/questions/35497/display-user-defined-types-and-their-details

schema_name | obj_name | column_name | data_type | ordinal_position | is_required | description
-------------+---------------------+-------------+--------------+------------------+-------------+-------------
public | money_with_currency | currency | character(3) | 1 | f |
public | money_with_currency | amount | numeric | 2 | f |
public | typed_id | type | text | 1 | f |
public | typed_id | id | bigint | 2 | f |
public | typed_refid | type | text | 1 | f |
public | typed_refid | refid | text | 2 | f |

Is it possible to support composite types by either creating Avro records/maps or at the least serializing them to json or string?