Change the DSL build method to internal

[be-hase]

Motivation

Currently, it is possible to improperly access the build method in the DSL.
This method should ideally be inaccessible.

What

I will change the build method to internal.
However, since it needs to be called from an inline function, it is necessary to add the @PublishedApi annotation.

Note

Strictly speaking, this is a breaking change... but I think it might be acceptable.

[making]

I'm not a Kotlin user and am not familiar with its usage, but why does the build method need to be done inside the DSL?

What inconvenience would arise by not exposing this method?

[be-hase]

Ah, your understanding is wrong. It's the opposite.
Currently, the build method is now publicly exposed. This PR is a change to encapsulate it.

[making]

That makes sense. I'll merge this change in the next minor version (0.15.0).
Thanks for your contribution!