Feat go

[raveclassic]

The PR add a go function (similar to https://github.com/funkia/hareactive#momentaf-sample-bb-behaviorb--b--a-behaviora) that allows lazy evaluation/subscription for conditional logic inside projection functions. Main benefit of such approach is performance.
However, the use case kindly provided by @artalar doesn't play well with the memoization design of combine function which requires at least one execution of projection function to warmup its internal cache.
Due to the issue above, this PR is a draft until this issue is resolved.

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