Improve print formatting of strings containing newline characters.

[nvdbaranec]

String data that contained \r and \n characters would print badly mangled.

Example column containing:

.,e,Infinity,+Infinity,-Infinity,+nAn,-naN,Nan,5f,1.2f,\riNf,NULL

Doing a cudf::test::print() on this would yield mostly garbage, but importantly, plausible-seeming but puzzling garbage:

iNf,NULLnity,+Infinity,-Infinity,+nAn,-naN,Nan,5f,1.2f,

The fix is to do a little postprocessing and replace the individual chars '\r' and '\n' with the escaped strings "\r" and "\n". Note that this only applies to the output ultimately sent to the print - not to the raw data retrieved from the device itself using ::to_host

[karthikeyann]

Replace string const& with string_view.
Rest all looks good.

[codecov]

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[ttnghia]

Rerun tests.

[vyasr]

@nvdbaranec good to merge this?

[nvdbaranec]

@gpucibot merge