colexec: add JSONFetchVal operator for vectorized engine
Previously, the vectorized engine had no support for JSONFetchVal operator. This commit added JSONFetchVal operator. In this commit, I added BytesFamily into compatible canonical type family group of DatumVecCanonicalTypeFamily. Then I declared JSONFetchVal as supported binary operator and registered output type of JSONFetchVal to generate operators. Release note (sql change): Vectorized engine now support JSONFetchVal(->) operator.
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