json: collapse set element commands from parser

json: collapse set element commands from parser

Update json parser to collapse {add,create} element commands to reduce
memory consumption in the case of large sets defined by one element per
command:

{"nftables": [{"add": {"element": {"family": "ip", "table": "x", "name":
"y", "elem": [{"set": ["1.1.0.0"]}]}}},...]}

Add CTX_F_COLLAPSED flag to report that command has been collapsed.

This patch reduces memory consumption by ~32% this case.

Fixes: 20f1c60ac8c8 ("src: collapse set element commands from parser")
Reported-by: Eric Garver <eric@garver.life>
Tested-by: Eric Garver <eric@garver.life>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>