Baseline switches for cli and extension

[Roang-zero1]

Description

Thanks for the great project, I have a feature request regarding the baseline.

There is, as far as I seen, no way to temporarily disable the baseline. I found I could use a non existent baseline e.g. --baselinefile . to make that happen.

For the cli that is easily done, but for the extension this is more problematic.

Therefore, my feature request is as follows:

• Add a --ignore-baseline option to the CLI
• Add a toggle for the baseline to the extension

This way I can see the errors while working and maybe fix some without changing the settings regularly.

[DetachHead]

Related: #1404

[KotlinIsland]

in basedmypy we had --baseline-file="", but that doesn't really help with this case

[DetachHead]

in #1667 i added a new --baselinemode argument which you can use to disable updates to the baseline file. though i don't think this covers your use case, in the future we can probably add a new mode called ignore or something