This small PR includes the Mustache build results in the public API to allow developers to better annotate types and pass the build result around if needed.

The discussion for this originated on Discord, so I'll include the important bits below for future readers:

me: Is there a design decision behind why the MustacheBuildResult type isn't marked public?

renerocksai: At the time, I probably thought it wouldn't be necessary to make it public, as it is returned by a pub fn anyway, which makes it kind-of-public. This choice makes it impossible (I think) to declare variables of this type in user code and encourages just assigning the result of the build function.

Do you have a need for var x : zap.Mustache.MustacheBuildResult = .{} and assigning later or similar? Ah, maybe passing it around or storing it in your own struct: I would rather use its .str() result to hold on to.

Feel free to submit a PR to make it pub. I might do so myself; but then I'd strip the Mustache off the type names (type shaving 🤣) of the load args and the build result.

me: I've switched to passing around strings at this point (maybe that's better anyway...?), but I found it strange that I couldn't add annotations for a return type of a public function. Not saying I need it changed; I just found it slightly jarring from an API perspective.