Make flags to the dbt command also be valid flags to all subcommands

[beckjake]

Feature

Add all dbt-level flags to each subcommand.

Feature description

dbt has a few useful flags that must be supplied to the dbt part of the command. For example, --debug is supplied to dbt, and dbt run --debug is an error - you have to use dbt --debug run. This is pretty minor, but it's really annoying when debugging: You can't just do !! --debug from your shell to re-run in debug mode (or, more frequently for my use case, !! --single-threaded/!! --record-timing-info). Instead you have to go insert the flag into the middle of your command.

I don't think there are any collisions currently so this should be perfectly safe, and it should be all doable within main.py.

Who will this benefit?

People who run dbt from the command line a lot and want to use dbt's global debugging flags.

[github-actions]

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