Add a new UR_DEVICE_INFO enum for checking bfloat16 native conversion in unified_runtime

[jinge90]

Is your feature request related to a problem? Please describe

SYCL runtime need to check whether underlying device supports native bfloat16 conversion to provide better performance for bfloat16 code in GPU device, this is done by checking "cl_intel_bfloat16_conversions" string. We need to switch to use urDeviceGetInfo API to query such hardware information. Currently, we don't have a UR device info enum for native bfloat16 which is equivalent to "cl_intel_bfloat16_conversions."

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[jinge90]

Hi, @steffenlarsen
The issue for UR device info enum for native bfloat16 conversions is created here.
Thanks very much.