Add async firmware cache clearing for multi-bond support #123

Job	Run time
bump-version	0s
check-version-tag	7s
check-security	4s
check-changes	7s
build-nrf52 (seeed_xiao_nrf52840)	2m 59s
build-nrf52 (adafruit_feather_nrf52840)	2m 55s
build-nrf52 (nordic_nrf52840dongle)	3m 17s
build-nrf52 (raytac_mdbt50q_cx_40)	3m 9s
build-nrf52 (aprbrother_nrf52840)	3m 0s
build-nrf52 (raytac_mdbt50q_rx)	2m 55s
build-nrf52 (makerdiary_nrf52840mdk)	3m 2s
build-esp32	0s
create-release	0s
	21m 35s

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