Support materialized CTEs using CTE builder

[koskimas]

The first argument of with can now be a callback that's given a CTE builder. The CTE builder can be used to create the common table expression statement.

db.with(
    (cte) => cte('jennifers').materialized(),
    (db) =>
      db
        .selectFrom('person')
        .where('first_name', '=', 'Jennifer')
        .select(['first_name', 'last_name as ln', 'gender'])
  )
  .selectFrom('jennifers')
  .select(['first_name', 'ln'])
  .execute()

The syntax feels natural and this way as materialized is "in the correct place" between the name and the query. But we're introducing a new way to do things here and I'm not sure if this a good precedent for future development, or just something completely disjoint from all other builders.

Putting the CTE builder last, after the query, also feels bad since it's in the wrong place. But that would be more in line with the other builders. 🤷

Closes #246

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Name	Status	Preview	Comments	Updated (UTC)
kysely	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 12, 2023 5:57am

[koskimas]

@igalklebanov I'll rename asMaterialized to materialized. as is not a part of materialized keyword.

[igalklebanov]

LGTM! 🚀

left some nitpicky minor comments/suggestions..