Feature/multiply and subtract

[oleksandr-pavlyk]

This PR adds dpctl.tensor.multiply and dpctl.tensor.subtract.

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• Have you made sure that new changes do not introduce compiler warnings?
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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1211/index.html

[coveralls]

Coverage: 84.039% (+0.005%) from 84.034% when pulling f25053f on feature/multiply-and-subtract into 18d1728 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.3dev1=py310h76be34b_118 ran successfully.
Passed: 231
Failed: 769
Skipped: 116

[github-actions]

Array API standard conformance tests for dpctl=0.14.3dev1=py310h76be34b_119 ran successfully.
Passed: 232
Failed: 768
Skipped: 116

[github-actions]

Array API standard conformance tests for dpctl=0.14.3dev1=py310h76be34b_124 ran successfully.
Passed: 230
Failed: 770
Skipped: 116

[ndgrigorian]

LGTM

[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=0.14.3dev1=py310h76be34b_124 ran successfully.
Passed: 232
Failed: 768
Skipped: 116