feat: Add initial implementation of Blake3 G function gadget #7
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This PR contains initial implementation of Blake3 G function gadget.
Essentially two inner gadgets are defined:
Add3, which computes addition of 3 u32 at once andXorRotateRight, which takes two u32 as input, computes their XOR and then rotates the XOR result. To check gadget's validity there is a test that uses standard Binius-style input with randomised data (viaunconstraintfunction) for the gadget and also in order to be sure that computations are valid, there is atest_vectortest that allows submitting some input and compare output produced by gadget and out-of-circuit implementation.