flow: Add cfg for optional flow reuse during low memory #27

Job	Run time
Prepare cbindgen	40s
Prepare dependencies	1m 7s
AlmaLinux 9	13m 34s
Fedora 38 (Suricata Verify codecov)	9m 6s
AlmaLinux 9 Test Templates	5m 21s
AlmaLinux 8	6m 35s
Debian 10	7m 26s
AlmaLinux 9 (no jansson)	1m 18s
Debian 12	25m 58s
Debian 11 (xdp)	7m 31s
Debian 12 Dist Builder	6m 46s
Debian 12 MSRV	24m 55s
Fedora 38 (clang, debug, asan, wshadow, rust-strict, systemd)	57m 29s
Fedora 38 (gcc, debug, asan, wshadow, rust-strict)	8m 7s
Fedora 39 (clang, debug, asan, wshadow, rust-strict, systemd)	7m 51s
Fedora 39 (gcc, debug, asan, wshadow, rust-strict)	8m 2s
Fedora 39 (non-root, debug, clang, asan, wshadow, rust-strict, systemd)	7m 28s
MacOS Latest	20m 2s
Ubuntu 20.04 (-DNDEBUG)	10m 22s
Ubuntu 22.04 (fuzz corpus coverage)	13m 7s
Ubuntu 22.04 (unittests coverage)	9m 4s
Ubuntu 22.04 (Debug Validation)	10m 45s
Ubuntu 22.04 (DPDK Build) (22.11.3)	14m 49s
Ubuntu 22.04 (Fuzz)	6m 7s
Ubuntu 22.04 (Netmap build)	3m 45s
Windows MSYS2 MINGW64 (libpcap)	24m 43s
Windows MSYS2 MINGW64 (NPcap)	24m 55s
Windows MSYS2 MINGW64 (WinDivert)	13m 14s
Ubuntu 22.04 (DPDK Build) (21.11.5)	12m 40s
Ubuntu 22.04 (DPDK Build) (20.11.9)	11m 6s
Ubuntu 22.04 (DPDK Build) (19.11.14)	10m 2s
CentOS Stream 9	5m 17s
CentOS 7	14m 53s
Ubuntu 20.04 (unsupported rust)	1m 59s
CentOS Stream 8	5m 12s
	6h 51m 16s

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