ci: Add CodeQL Workflow for Code Security Analysis #174

Job	Run time
populate-targets	5s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	15s
newt dump (bleprph-nrf52840pdk, windows-latest)	1m 10s
newt dump (bleprph-nrf52840pdk, macos-latest)	23s
newt dump (boot-nrf52dk, ubuntu-latest)	19s
newt dump (boot-nrf52dk, windows-latest)	2m 6s
newt dump (boot-nrf52dk, macos-latest)	24s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	15s
newt dump (btshell-nrf52840pdk, windows-latest)	1m 17s
newt dump (btshell-nrf52840pdk, macos-latest)	27s
newt dump (btshell-nrf52dk, ubuntu-latest)	15s
newt dump (btshell-nrf52dk, windows-latest)	1m 48s
newt dump (btshell-nrf52dk, macos-latest)	20s
newt dump (my_blinky_sim, ubuntu-latest)	19s
newt dump (my_blinky_sim, windows-latest)	1m 42s
newt dump (my_blinky_sim, macos-latest)	59s
	12m 4s

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