fix: validate recipe name and plugin in gen

[ravisuhag]

closes #207

[StewartJingga]

@ravisuhag i wonder if recipe generator can be handled in the recipe packages, so it would be like recipe.Build().

But it seems like it would mess recipe package dependencies.

[ravisuhag]

@ravisuhag i wonder if recipe generator can be handled in the recipe packages, so it would be like recipe.Build().

But it seems like it would mess recipe package dependencies.

Had the same thought and same concern. :) So kept it separate. I will add a note to consider this future if it makes sense.

[StewartJingga]

LGTM, but for handling indentation in the template, I was thinking to utilise go template pipeline feature.

so it would be like this

config:
{{ $value | indent 6 }}

similar to how helm handles it.

tried to do it on local but had to change a few things in all the plugins to achieve that, we can treat it as a good to have for now.