[nrf52, ota] ble and serial OTA based on mcumgr (#11932)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@koston.org>
Co-authored-by: J. Nick Koston <nick+github@koston.org>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

CODEOWNERS

@@ -587,6 +587,7 @@ esphome/components/xl9535/* @mreditor97
 esphome/components/xpt2046/touchscreen/* @nielsnl68 @numo68
 esphome/components/xxtea/* @clydebarrow
 esphome/components/zephyr/* @tomaszduda23
+esphome/components/zephyr_mcumgr/ota/* @tomaszduda23
 esphome/components/zhlt01/* @cfeenstra1024
 esphome/components/zigbee/* @tomaszduda23
 esphome/components/zio_ultrasonic/* @kahrendt