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Migrate `dpctl.tensor` into `dpnp.tensor` (#2856)

This PR migrates the tensor implementation from `dpctl.tensor` into
`dpnp.tensor` making dpnp the primary owner of the Array API-compliant
tensor layer

Major changes:

- Move compiled C++/SYCL extensions (`_tensor_impl,
_tensor_elementwise_impl, _tensor_reductions_impl, _tensor_sorting_impl,
_tensor_accumulation_impl, tensor linalg`) into `dpnp.tensor`
- Move `usm_ndarray`, `compute-follows-data utilities` and tensor
`tests` from dpctl
- Replace all `dpctl.tensor` references with `dpnp.tensor` in
docstrings, error messages and comments
- Remove redundant dpctl.tensor C-API  interface
- Add `tensor.rst` documentation page describing the module, its
relationship to `dpnp.ndarray` and `dpctl` and linking to the `dpctl
0.21.1 API` reference

This simplifies maintenance, reduces cross-project dependencies and
enables independent development and release cycles

1573 of 2908 branches covered (54.09%)

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26259 of 32579 relevant lines covered (80.6%)

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