Disallow scalar conversation for non-0D arrays

[vlad-perevezentsev]

This PR aligns usm_ndarray scalar conversion semantics with the Python Array API by allowing scalar conversion only for 0D usm_ndarrays

Conversions to Python numeric scalars via int, float, complex, bool, and their corresponding methods (__int__, _float__, __complex__, bool) now raise TypeErrorwhen applied to usm_ndarrays withndim !=0`

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/2223/index.html

[github-actions]

Array API standard conformance tests for dpctl=0.22.0dev0=py310h93fe807_103 ran successfully.
Passed: 1114
Failed: 44
Skipped: 82

[coveralls]

coverage: 86.245%. remained the same
when pulling 5f28594 on disallow_conv_to_scalar_ndim
into 4c57ee7 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.22.0dev0=py310h93fe807_108 ran successfully.
Passed: 1112
Failed: 46
Skipped: 82

[ndgrigorian]

aside from minor comments this LGTM

[github-actions]

Array API standard conformance tests for dpctl=0.22.0dev0=py310h93fe807_109 ran successfully.
Passed: 1114
Failed: 44
Skipped: 82

[github-actions]

Array API standard conformance tests for dpctl=0.22.0dev0=py310h93fe807_110 ran successfully.
Passed: 1114
Failed: 44
Skipped: 82