[Feature] Add --force-incremental flag to dbt compile

[Bladieblah]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Add a --force-incremental flag to the dbt compile command which makes all is_incremental macro's evaluating to true.

Describe alternatives you've considered

• Doing a manual initial load isn't feasible on a large scale dataplatform

Who will this benefit?

In order to properly run self-service dbt on a data platform, I need to validate dbt code before deploying it. Most of the models are incremental, which requires checking the compiled code for initial load/full refresh as well as incremental updates.

Are you interested in contributing this feature?

Yes, new to the dbt codebase so any pointers would be appreciated

Anything else?

No response