Added size check to Bowe-Hopwood gadget evaluate method

[rozbb]

Description

Previously, the Bowe-Hopwood CRH gadget would silently fail to hash inputs whose bitlength exceeded NUM_WINDOWS * WINDOW_SIZE * 3. This makes it easy to miss simple things in development, but it's probably not a security issue, since any gadget eval is almost certainly accompanied by a native eval, which does have the size check. Instead, it should say that the input is too large, as the Pedersen CRH gadget does.

This PR adds the check, and also a regression test.

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