Generate the scalar-valued array accessors

[estebanzimanyi]

Add a generator template for array-returning accessors of the form (inputs…, int *count) -> <scalar>*, where the trailing int * is the element-count out-param and the return is a contiguous fixed-width scalar array. These carry an int * out-param, so the 1:1 and @sqlfn passes exclude them (arg:int *). The template marshals the inputs, allocates the count buffer, and reads the returned array into a Spark array<int|long|double>, freeing it the same way the NxN array kernels do.

Reaches 10 accessors under their C names; the 1:1 generated surface grows by 10 (to 2798):

• tint_values / tfloat_values / tbigint_values
• intset_values / floatset_values / bigintset_values
• th3index_values, tquadbin_values, pose_orientation, quadbin_k_ring

Struct-element arrays (Span* / STBox* / TBox*) stay excluded — their per-element stride is opaque to the binding — as do TimestampTz* elements, which need MEOS-owned rendering rather than a raw long.

A GeneratedSurfaceTest case covers the surface end-to-end against libmeos: tint_values of [1, 2, 1] is the distinct set {1, 2} (size 2, contains 1 and 2), and tfloat_values returns the two distinct doubles — verifying the count out-param, the fixed-stride read, and the array marshalling for both int and double elements.