Add dpctl.SyclQueue.fill() method

[vlad-perevezentsev]

This PR proposes adding dpctl.SyclQueue.fill and dpctl.SyclQueue.fill_async methods as a Python wrapper over sycl::queue::fill backed by the existing DPCTLQueue_Fill8/16/32/64/128 and new DPCTLQueue_Fill8/16/32/64/128WithEvents C-API functions and adding a new test_sycl_queue_fill.py

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[github-actions]

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

[coveralls]

coverage: 74.797% (+0.3%) from 74.51% — add_sycl_queue_fill into master

[ndgrigorian]

LGTM