Fixed behavior of mathematical functions for scalars.

[npolina4]

Fixed behavior of mathematical functions for floating-point and complex floating-point scalars.
Added test.
Resolves #1219
Resolves IntelPython/dpnp#1304

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1233/index.html

[coveralls]

coverage: 84.054% (+0.02%) from 84.035% when pulling 4a09766 on fix_multiply_scalar_dtype into 1596a13 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.3dev3=py310h7bf5fec_15 ran successfully.
Passed: 273
Failed: 727
Skipped: 119

[ndgrigorian]

To demonstrate some changes of behavior

before this PR:

In [20]: dpt.add(dpt.asarray(3, dtype="c8"), 3j)
Out[20]: usm_ndarray(3.+3.j)

(dtype is dpt.complex128, which is incorrect as per NEP-050)

after:

In [6]: dpt.add(dpt.asarray(3, dtype="c8"), 3j)
Out[6]: usm_ndarray(3.+3.j, dtype=complex64)

[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=0.14.3dev3=py310h7bf5fec_16 ran successfully.
Passed: 321
Failed: 679
Skipped: 119