Motivation

Postgres arrays are not supported in the query binders (see #275) or drivers.

Proposed Solutions

We should implement the conversion from Vec<sea-query::Value> to some Vec<sqlx::Encode> in sea-query-binders/src/sqlx_postgres.rs. For this, we'll need to ensure that all values are of the same type, and do a second level of dispatch based on the value types to convert them to the right type.