Resolve an issue with cyclic import in linalg submodule (#2608)

The PR reworks the import of `linalg` submodule to avoid a wildcard
import.

Also it resolves the issue reported by pylint:
> Cyclic import (dpnp.linalg -> dpnp.linalg.dpnp_iface_linalg ->
dpnp.linalg.dpnp_utils_linalg) (cyclic-import)

and moves `LinAlgError` exception to be exposed by LAPACK pybind11
extension, because it is created there.
While later the exception patched at python level to be set to
"dpnp.linalg" submodule explicitly.

Otherwise we have the import cycle like:
> linalg/__init__.py -> dpnp_iface_linalg.py -> dpnp_utils_linalg.py ->
linalg/__init__.py

which might cause the import failure. 285c313

Author: github-actions[bot]

.buildinfo

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+  <title>dpnp.dpnp_flatiter &mdash; Data Parallel Extension for NumPy 0.19.0rc0+5.g285c3137d1 documentation</title>
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     </script>
 
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-  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.19.0rc0+4.g2bdbd052fde documentation</title>
+  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.19.0rc0+5.g285c3137d1 documentation</title>
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@@ -137,7 +137,6 @@ <h1>Source code for dpnp.dpnp_iface</h1><div class="highlight"><pre>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.dpnp_algo</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.dpnp_array</span><span class="w"> </span><span class="kn">import</span> <span class="n">dpnp_array</span>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.fft</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
-<span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.linalg</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.memory</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.random</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
 <span class="kn">from</span><span class="w"> </span><span class="nn">dpnp.special</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>

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+  <title>dpnp.dpnp_iface_arraycreation &mdash; Data Parallel Extension for NumPy 0.19.0rc0+5.g285c3137d1 documentation</title>
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