Feature request: plugin support for kotlin override modifier generation

[Turmiht]

Seemly currently org.mybatis.generator.api.dom.kotlin.KotlinFunction do not contains a way to add override modifier(It's not in KotlinModifier variants.
My workaround for that is using withAnnotation("override"), which is fragile when other annotations added after override.
Maybe there should be a dedicated method in KotlinFunction.Builder for doing it.

[jeffgbutler]

Good catch! I think it will be easiest to add a value to KotlinModifier - nothing else should need to change.