Fix Jacobi eigensolver convergence and improve ArrayFire bindings

[dmjio]

• Replace sweep-based iteration with bounded rotation count and scale-invariant convergence detection (tol = 1e-14 * max|A|)
• Return error code 2 on non-convergence instead of silent inaccurate results
• Add input validation in af_eigsh: reject non-square or non-2D inputs
• Fix type signatures: add Fractional constraints to trigonometric functions, correct matcher return types to (Array Word32, Array a)
• Fix constant array creation for b8 and non-fp64 OpenCL devices
• Fix memory leaks in getInfoString and arrayToString (free af_alloc_host strings)
• Fix momentsAll to return variable-length list based on moment bitmask
• Guard createSparseArrayFromDense against all-zero matrices (prevents segfault)
• Add vision test skips for broken OpenCL backend on AF 3.8.2