Array API: port straightforward functions in `arraytools`

### Is Your Feature Request Related to a Problem? Please Describe

- [ ] `arraytools.broadcast_first`
- [ ] `arraytools.broadcast_leading_axes`
- [ ] `arraytools.ndinterp`
- [ ] `arraytools.trapz_product`
- [ ] `arraytools.cumtrapz`

### Describe the Solution You'd Like

_No response_

### Describe Alternatives You've Considered

_No response_

### Additional Context

_No response_