create config aliases for pre-hook and post-hook

[drewbanin]

Feature

Feature description

Pre-hooks and post-hooks can be specified in a config() block, but they require the use of a dictionary instead of a list of keyword arguments. Instead, dbt should support the specification of these hooks using pre_hook and post_hook aliases.

Before:

{{
  config({
    "post-hook" : "grant select on {{ this }} to db_reader"
  })
}}

After:

{{
  config(
    post_hook="grant select on {{ this }} to db_reader"
  )
}}

Who will this benefit?

This will be a quality of life improvement for many dbt users :)