net: lwm2m: Historical data cache API update

New API for enable Historical data storage for LwM2M resource.
Data cache is only supported at resource which resource size is
static and well known.

Extend output writer for write cached data timestamp.

Enable cache support for Resource set and Read operation.

Added possibility for for drop latest or oldest data from cache.

Signed-off-by: Juha Heiskanen <juha.heiskanen@nordicsemi.no>