Addressed gh-891, improved SyclDevice ctor error message

[oleksandr-pavlyk]

Improved exception message when SyclDevice could not created from invalid filter string. Closes #891

In [1]: import dpctl

In [2]: dpctl.SyclDevice("invalid")
---------------------------------------------------------------------------
SyclDeviceCreationError                   Traceback (most recent call last)
Input In [2], in <cell line: 1>()
----> 1 dpctl.SyclDevice("invalid")

File ~/repos/dpctl/dpctl/_sycl_device.pyx:295, in dpctl._sycl_device.SyclDevice.__cinit__()
    293             ret = self._init_from_selector(DSRef)
    294             if ret == -1:
--> 295                 raise SyclDeviceCreationError(
    296                     "Could not create a SyclDevice with the selector string "
    297                     "'{selector_string}'".format(selector_string=arg)

SyclDeviceCreationError: Could not create a SyclDevice with the selector string 'invalid'

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/893/index.html

[coveralls]

Coverage increased (+0.002%) to 81.842% when pulling b3e07bf on gh-891-better-error-msg into 8414053 on master.

[github-actions]

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