Improve array API conformity

[ndgrigorian]

Minor changes throughout dpctl to improve array API conformity.

Function signature changes to match array API
Notably introduces finfo_object subclass of np.finfo. finfo_objects return eps, max, min, and smallest_normal as Python floats.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1110/index.html

[coveralls]

Coverage: 82.404% (+0.001%) from 82.403% when pulling 4012039 on array-api-cleanup into 5bfc097 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.2=py310h76be34b_8 ran successfully.
Passed: 46
Failed: 788
Skipped: 280

[oleksandr-pavlyk]

Just to be explicit, dpt.iinfo needs to no changes since it already returns struct with fields of type int.

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.14.2=py310h76be34b_8 ran successfully.
Passed: 46
Failed: 788
Skipped: 280