Missing COnnection type

### Describe the Feature

support for connection type PostgreSQL .


### Expected Behavior

when creating a new glu_connection, that we will be able to use Postgres.

### Use Case

Connect to Postgres, using glue.

### Describe Ideal Solution

connection_type        = "POSTGRESQL"
as part of the module.


### Alternatives Considered

_No response_

### Additional Context

_No response_