Implement BF16 using generic_float class (#3578) #21700

Job	Run time
Check if image exists in registry	9s
licensing	2m 53s
cancel	4s
linux (ubuntu-20.04, debug)	2h 31m 14s
linux (ubuntu-20.04, release)	1h 42m 1s
pyflakes	3m 17s
linux (ubuntu-20.04, codecov)	1h 36m 28s
linux-fpga (ubuntu-20.04, debug)	2h 35m 27s
misspell	15s
Build SLES image	0s
Build image	0s
format	4m 49s
cppcheck	58m 2s
sles	35m 52s
tidy	1h 26m 28s
	11h 36m 59s

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