feat: Add support for insert with alias #4003

[zbarbuto]

Description of change

Adds support for alias on insertQueryBuilder. This is particularly useful when dealing with ON CONFLICT as you can reference the original table to do an update or nothing based on a condition.

Fixes #4003

As an aside question - would it be possible to un-deprecate onConflict as it is still useful for this sort of complex ON CONFLICT work which isn't possible with orUpdate or orIgnore

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run format to apply prettier formatting
• npm run test passes with this change (*tests for the code I changed at least)
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change (See above - onConflict has no docs right now)
• The new commits follow conventions explained in CONTRIBUTING.md

[pleerock]

Thank you for contribution! 🎉