Feature request: add NotImplementedError ```dpctl.tensor.linalg``` module

[icfaust]

The dpctl package exposes the __array_namespace__ and nearly implements the full array API standard, however, it specifically skips the conformance tests related to linalg: https://github.com/IntelPython/dpctl/blob/master/.github/workflows/array-api-skips.txt . The module is non existent, so attempts to use it lead to AttributeErrors. Ideally they should be masked with NotImplementedError giving an informative reason why, and makes interfacing and understanding issues with array API support simpler.