boot_serial: Add optional img mgmt slot info feature #1955

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	1m 51s
environment (esp32, serialrecovery)	1m 27s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 50s
environment (esp32s2, serialrecovery)	1m 32s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 50s
environment (esp32s3, serialrecovery)	1m 25s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 52s
environment (esp32c3, serialrecovery)	1m 31s
environment (esp32, multi-image,multi-boot, multi)	1m 30s
environment (esp32s3, multi-image,multi-boot, multi)	1m 39s
	16m 27s

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