Allow private validate and compute methods

[rodrigogiraoserrao]

Following up on #2382 and #2442, and exactly for the same reasons, it also makes sense to allow for validate and compute methods to be private.
Can we implement this feature?

[willmcgugan]

I think this is implemented. Need to confirm.

[davep]

Grabbing to at least confirm (will look for tests and if none exist, add them).

[davep]

Confirmed as not implemented.

[davep]

While writing a couple of tests for this I did think of one wrinkle to this. watch can be public or private and if both methods exist both are called. That makes sense.

On the other hand, for validate and compute it's all about the return value. Supporting both existing could get confusing, perhaps?

[rodrigogiraoserrao]

For validate, I wouldn't be surprised if we had new_value -> private validate -> public validate.
For compute, I'd raise an error saying you can't have two?

[davep]

@rodrigogiraoserrao Aye, I like that flow for validate; that makes sense to me.

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