net: openthread: Add new kconfig OT options.

Adding:
	- `OPENTHREAD_BORDER_AGENT_EPHEMERAL_KEY_ENABLE`
	- `OPENTHREAD_CHANNEL_MANAGER_CSL`
	- `OPENTHREAD_PLATFORM_LOG_CRASH_DUMP`
	- `OPENTHREAD_MULTICAST_DNS`
	- `OPENTHREAD_VERHOEFF_CHECKSUM`

Signed-off-by: Przemyslaw Bida <przemyslaw.bida@nordicsemi.no>