Add FuzzyDuck fuzzer - and move fuzzer CI to separate repo #7712
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This PR adds a new fuzzer - the FuzzyDuck fuzzer - to the
sqlsmithextension. This fuzzer uses our own internal statement to string conversion code to generate random SELECT statements (to be expanded in the future to different statement types). The generation is completely random with no specific targeting or learning, similar to SQLSmith. The advantage of this over SQLSmith is that by using our own statement infrastructure we can support many more types of statements and expressions, including things like window functions, different join types, lambda functions, etc.Usage of the fuzzer is similar to SQLSmith: