Missing xtensor top level functions

[ricardoV94]

Description

Checking https://docs.xarray.dev/en/stable/api.html#top-level-functions

The following (unchecked) top level functions are missing. I filtered out ones that are not relevant for PyTensor

• [x] broadcast
• [x] concat
• [ ] where
• [x] full_like
• [x] zeros_like
• [x] ones_like
• [ ] cov
• [ ] corr
• [ ] cross
• [x] dot
  • [ ] dot with arbitrary number of inputs