Add dpnp.linalg.solve() function (#1598)

* Add dpnp.linalg.solve() function
* Add cupy tests for dpnp.linalg.solve()
* Register a LinAlgError in dpnp.linalg submodule
* Implementation of dtype dispatching with _common_type for dpnp.linalg.solve
* Add a common_helpers.hpp file
* Add validation functions for array types and dimensions for linalg funcs
* Skip test_solve_singular_empty

---------

Co-authored-by: Anton <[email protected]> 74609d6

Author: github-actions[bot]

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