Rewrite the thanos-bucket component without ksonnet

[metalmatze]

As you can see there are no changes in the examples/all so the output
generated is equal to before.

[kakkoyun]

🥇 LGTM.

We just need to remove the import line, I believe.
local k = import 'ksonnet/ksonnet.beta.4/k.libsonnet';

[metalmatze]

Yes, lol 😄

[yeya24]

I am curious about the motivation behind this. So we don't want to use the ksonnet library anymore?

[metalmatze]

In the end this is about readability mostly.
It's 10x easier for people to read and write this kind of code, whereas ksonnet only adds so much type safety.
Over the last couple of years it became more and more obvious that we should focus on the first one and use some other tool to check the output. kubeval so far has been really helpful.

[yeya24]

That makes sense. Thank you!