einx v0.3.0

Added

• Add partial support for tinygrad.
  • Supported:
    • einx.rearrange
    • einx.{elementwise|add|multiply|where|...}
    • einx.{reduce|sum|mean|...}
    • einx.{vmap_with_axis|flip|softmax|...}
    • einx.dot
  • Not supported:
    • einx.vmap (no vmap in tinygrad)
    • einx.{index|get_at|set_at|...} (due to relying on einx.vmap)

Changed

• Use tf.gather_nd instead of x[y] to implement einx.get_at for Tensorflow.

Fixed

• Allow empty tuples and lists as constraints for ellipsis parameters.
• Fix shorthand notation in einx.dot.