Modified gen_coverage to also collect data from Pybind11 modules

[oleksandr-pavlyk]

This will provide coverage for the host portion of offloading Pybind11 extensions.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1476/index.html

[coveralls]

coverage: 89.644% (+3.6%) from 85.998%
when pulling 644eadc on coverage-for-pybind11-extensions
into 46583b8 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_18 ran successfully.
Passed: 1018
Failed: 56
Skipped: 59

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_19 ran successfully.
Passed: 1018
Failed: 56
Skipped: 59

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_20 ran successfully.
Passed: 1019
Failed: 55
Skipped: 59

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_38 ran successfully.
Passed: 877
Failed: 55
Skipped: 59

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_39 ran successfully.
Passed: 879
Failed: 53
Skipped: 59

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev2=py310h15de555_42 ran successfully.
Passed: 877
Failed: 55
Skipped: 59

[ndgrigorian]

LGTM, nice to see the coverage so high, thank you @oleksandr-pavlyk