A few Typescript and Knex issues

[Linksku]

Here are some misc things that I think could be changed. I've never written an open source PR before, I think it's easier if an existing contributor changed it:

1. Knex supports objects for joins and aggregates. It's especially useful for multi-column joins:

.join(
  'foo',
  {
    'foo.col1': 'bar.col1',
    'foo.col2': 'bar.col2',
  },
)

Something like this ((table: TableRef<QB>, columns: Record<string, ColumnRef>): QB;) could be added to JoinMethod.

2. Knex's limit now supports an additional param "skipBinding" (https://github.com/knex/knex/issues/4805). Objection's FirstOperation calls limit without skipBinding, which triggers an error in some databases (Materialize).

3. Objection's type exports UniqueViolationError, but this actually needs to be imported from db-errors.

4. Objection's Model type doesn't include "propertyNameToColumnName".

5. (not a real issue) addOperation and KnexOperation aren't documented or exposed through types, but they're useful for new or custom Knex operations.

Thanks for building and maintaining this awesome library!

[throrin19]

Same problems here for Objection errors. In Typescript We can't do that :

import { UniqueViolationError } from 'objection';