This add `gen-spec` which provides a fairly general macro for creating `test.check` specifications for vector instructions. It takes a string used to generate specification names, a function used to check the state after running the function under test, and a list of keywords indicating types for arguments generated by `test.check` and passed to the check function.
Keywords like `:integer` and `:string` are associated with "simple" generators such as `gen/small-integer` and `gen/string`. The keyword `:vector` is used to generate a vector of items whose type is specified by the `generator` argument to `generator-for-arg-type`. This allows us to loop over all of the supported vector item types in the macro and generate a separate specification for each type.
We moved the `value-type` argument for the `check` functions to the front to simplify passing in the value type arguments, which can vary in number.
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