feat: add configure_mode & configure_devtool attributes to webpack_bundle and webpack_devserver

[gregmagolan]

In some cases, users don't want the generated base config to touch mode & devtool

[jbedard]

These can't be overridden in the user config files? We need to explicitly not set them? 🫤

[gregmagolan]

These can't be overridden in the user config files? We need to explicitly not set them? 🫤

They can be but users might not pass config files or just want the default behaviour

[jbedard]

How common is it to not have a config and not want default behavior? If it's rare I'd vote to not add more to the API. Or maybe add a single flag "use_defaults" or something like that? Then that flag can just swap between preset config files...

[gregmagolan]

So far one request from a client but it is a low sample size so I don't think we can know how common it will be.
I considered use_defaults but the generated base config does have sane and useful defaults for infrastructureLogging, optimization & output that I don't think makes sense to be able to turn off. Just mode and devtool are the contentious ones for the client.