feat: add flags to json schema

[pquadri]

closes #141

small note: i did not sort the keys with the extension as a good chunk of the file isn't and i didn't want to produce a huge diff

[aleix-cd]

Out of curiosity: shouldn't the flags object also accept all the global config flags specified here (where Supported in project? = ✅ )?

[pquadri]

Out of curiosity: shouldn't the flags object also accept all the global config flags specified here (where Supported in project? = ✅ )?

guess so, i ignored the first part of https://github.com/dbt-labs/dbt-core/blob/d389ff1450e72c51eee443facf779736677768bb/core/dbt/contracts/project.py#L322 😅 , updating

[joellabes]

@pquadri thank you for opening this! (And sorry for the delay getting back to you).

Looks great - just waiting for the checks to pass and I'll get this merged! There's some custom sort logic in .vscode/settings.json which if your sorter doesn't align with would lead to weird diffs. I ran it locally for you.

I've also removed the flags from dbt_project.json which is legacy from <1.4 and only exists for backwards compatibility reasons.